text: //    PouchDB 3.5.0
  //    
  //    (c) 2012-2015 Dale Harvey and the PouchDB team
  //    PouchDB may be freely distributed under the Apache license, version 2.0.
  //    For all details and documentation:
  //    http://pouchdb.com
  (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.PouchDB = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
  "use strict";
  
  var utils = _dereq_(36);
  var merge = _dereq_(31);
  var errors = _dereq_(19);
  var EventEmitter = _dereq_(40).EventEmitter;
  var upsert = _dereq_(27);
  var Changes = _dereq_(13);
  var Promise = utils.Promise;
  
  /*
   * A generic pouch adapter
   */
  
  // returns first element of arr satisfying callback predicate
  function arrayFirst(arr, callback) {
    for (var i = 0; i < arr.length; i++) {
      if (callback(arr[i], i) === true) {
        return arr[i];
      }
    }
    return false;
  }
  
  // Wrapper for functions that call the bulkdocs api with a single doc,
  // if the first result is an error, return an error
  function yankError(callback) {
    return function (err, results) {
      if (err || (results[0] && results[0].error)) {
        callback(err || results[0]);
      } else {
        callback(null, results.length ? results[0]  : results);
      }
    };
  }
  
  // for every node in a revision tree computes its distance from the closest
  // leaf
  function computeHeight(revs) {
    var height = {};
    var edges = [];
    merge.traverseRevTree(revs, function (isLeaf, pos, id, prnt) {
      var rev = pos + "-" + id;
      if (isLeaf) {
        height[rev] = 0;
      }
      if (prnt !== undefined) {
        edges.push({from: prnt, to: rev});
      }
      return rev;
    });
  
    edges.reverse();
    edges.forEach(function (edge) {
      if (height[edge.from] === undefined) {
        height[edge.from] = 1 + height[edge.to];
      } else {
        height[edge.from] = Math.min(height[edge.from], 1 + height[edge.to]);
      }
    });
    return height;
  }
  
  function allDocsKeysQuery(api, opts, callback) {
    var keys =  ('limit' in opts) ?
        opts.keys.slice(opts.skip, opts.limit + opts.skip) :
        (opts.skip > 0) ? opts.keys.slice(opts.skip) : opts.keys;
    if (opts.descending) {
      keys.reverse();
    }
    if (!keys.length) {
      return api._allDocs({limit: 0}, callback);
    }
    var finalResults = {
      offset: opts.skip
    };
    return Promise.all(keys.map(function (key) {
      var subOpts = utils.extend(true, {key: key, deleted: 'ok'}, opts);
      ['limit', 'skip', 'keys'].forEach(function (optKey) {
        delete subOpts[optKey];
      });
      return new Promise(function (resolve, reject) {
        api._allDocs(subOpts, function (err, res) {
          if (err) {
            return reject(err);
          }
          finalResults.total_rows = res.total_rows;
          resolve(res.rows[0] || {key: key, error: 'not_found'});
        });
      });
    })).then(function (results) {
      finalResults.rows = results;
      return finalResults;
    });
  }
  
  utils.inherits(AbstractPouchDB, EventEmitter);
  module.exports = AbstractPouchDB;
  
  function AbstractPouchDB() {
    EventEmitter.call(this);
  }
  
  AbstractPouchDB.prototype.post =
    utils.adapterFun('post', function (doc, opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    if (typeof doc !== 'object' || Array.isArray(doc)) {
      return callback(errors.error(errors.NOT_AN_OBJECT));
    }
    this.bulkDocs({docs: [doc]}, opts, yankError(callback));
  });
  
  AbstractPouchDB.prototype.put =
    utils.adapterFun('put', utils.getArguments(function (args) {
    var temp, temptype, opts, callback;
    var doc = args.shift();
    var id = '_id' in doc;
    if (typeof doc !== 'object' || Array.isArray(doc)) {
      callback = args.pop();
      return callback(errors.error(errors.NOT_AN_OBJECT));
    }
    doc = utils.clone(doc);
    while (true) {
      temp = args.shift();
      temptype = typeof temp;
      if (temptype === "string" && !id) {
        doc._id = temp;
        id = true;
      } else if (temptype === "string" && id && !('_rev' in doc)) {
        doc._rev = temp;
      } else if (temptype === "object") {
        opts = temp;
      } else if (temptype === "function") {
        callback = temp;
      }
      if (!args.length) {
        break;
      }
    }
    opts = opts || {};
    var error = utils.invalidIdError(doc._id);
    if (error) {
      return callback(error);
    }
    if (utils.isLocalId(doc._id) && typeof this._putLocal === 'function') {
      if (doc._deleted) {
        return this._removeLocal(doc, callback);
      } else {
        return this._putLocal(doc, callback);
      }
    }
    this.bulkDocs({docs: [doc]}, opts, yankError(callback));
  }));
  
  AbstractPouchDB.prototype.putAttachment =
    utils.adapterFun('putAttachment', function (docId, attachmentId, rev,
                                                blob, type, callback) {
    var api = this;
    if (typeof type === 'function') {
      callback = type;
      type = blob;
      blob = rev;
      rev = null;
    }
    if (typeof type === 'undefined') {
      type = blob;
      blob = rev;
      rev = null;
    }
  
    function createAttachment(doc) {
      doc._attachments = doc._attachments || {};
      doc._attachments[attachmentId] = {
        content_type: type,
        data: blob
      };
      return api.put(doc);
    }
  
    return api.get(docId).then(function (doc) {
      if (doc._rev !== rev) {
        throw errors.error(errors.REV_CONFLICT);
      }
  
      return createAttachment(doc);
    }, function (err) {
       // create new doc
      if (err.reason === errors.MISSING_DOC.message) {
        return createAttachment({_id: docId});
      } else {
        throw err;
      }
    });
  });
  
  AbstractPouchDB.prototype.removeAttachment =
    utils.adapterFun('removeAttachment', function (docId, attachmentId, rev,
                                                   callback) {
    var self = this;
    self.get(docId, function (err, obj) {
      if (err) {
        callback(err);
        return;
      }
      if (obj._rev !== rev) {
        callback(errors.error(errors.REV_CONFLICT));
        return;
      }
      if (!obj._attachments) {
        return callback();
      }
      delete obj._attachments[attachmentId];
      if (Object.keys(obj._attachments).length === 0) {
        delete obj._attachments;
      }
      self.put(obj, callback);
    });
  });
  
  AbstractPouchDB.prototype.remove =
    utils.adapterFun('remove', function (docOrId, optsOrRev, opts, callback) {
    var doc;
    if (typeof optsOrRev === 'string') {
      // id, rev, opts, callback style
      doc = {
        _id: docOrId,
        _rev: optsOrRev
      };
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
    } else {
      // doc, opts, callback style
      doc = docOrId;
      if (typeof optsOrRev === 'function') {
        callback = optsOrRev;
        opts = {};
      } else {
        callback = opts;
        opts = optsOrRev;
      }
    }
    opts = utils.clone(opts || {});
    opts.was_delete = true;
    var newDoc = {_id: doc._id, _rev: (doc._rev || opts.rev)};
    newDoc._deleted = true;
    if (utils.isLocalId(newDoc._id) && typeof this._removeLocal === 'function') {
      return this._removeLocal(doc, callback);
    }
    this.bulkDocs({docs: [newDoc]}, opts, yankError(callback));
  });
  
  AbstractPouchDB.prototype.revsDiff =
    utils.adapterFun('revsDiff', function (req, opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    opts = utils.clone(opts);
    var ids = Object.keys(req);
  
    if (!ids.length) {
      return callback(null, {});
    }
  
    var count = 0;
    var missing = new utils.Map();
  
    function addToMissing(id, revId) {
      if (!missing.has(id)) {
        missing.set(id, {missing: []});
      }
      missing.get(id).missing.push(revId);
    }
  
    function processDoc(id, rev_tree) {
      // Is this fast enough? Maybe we should switch to a set simulated by a map
      var missingForId = req[id].slice(0);
      merge.traverseRevTree(rev_tree, function (isLeaf, pos, revHash, ctx,
        opts) {
          var rev = pos + '-' + revHash;
          var idx = missingForId.indexOf(rev);
          if (idx === -1) {
            return;
          }
  
          missingForId.splice(idx, 1);
          if (opts.status !== 'available') {
            addToMissing(id, rev);
          }
        });
  
      // Traversing the tree is synchronous, so now `missingForId` contains
      // revisions that were not found in the tree
      missingForId.forEach(function (rev) {
        addToMissing(id, rev);
      });
    }
  
    ids.map(function (id) {
      this._getRevisionTree(id, function (err, rev_tree) {
        if (err && err.status === 404 && err.message === 'missing') {
          missing.set(id, {missing: req[id]});
        } else if (err) {
          return callback(err);
        } else {
          processDoc(id, rev_tree);
        }
  
        if (++count === ids.length) {
          // convert LazyMap to object
          var missingObj = {};
          missing.forEach(function (value, key) {
            missingObj[key] = value;
          });
          return callback(null, missingObj);
        }
      });
    }, this);
  });
  
  // compact one document and fire callback
  // by compacting we mean removing all revisions which
  // are further from the leaf in revision tree than max_height
  AbstractPouchDB.prototype.compactDocument =
    utils.adapterFun('compactDocument', function (docId, maxHeight, callback) {
    var self = this;
    this._getRevisionTree(docId, function (err, revTree) {
      if (err) {
        return callback(err);
      }
      var height = computeHeight(revTree);
      var candidates = [];
      var revs = [];
      Object.keys(height).forEach(function (rev) {
        if (height[rev] > maxHeight) {
          candidates.push(rev);
        }
      });
  
      merge.traverseRevTree(revTree, function (isLeaf, pos, revHash, ctx, opts) {
        var rev = pos + '-' + revHash;
        if (opts.status === 'available' && candidates.indexOf(rev) !== -1) {
          revs.push(rev);
        }
      });
      self._doCompaction(docId, revs, callback);
    });
  });
  
  // compact the whole database using single document
  // compaction
  AbstractPouchDB.prototype.compact =
    utils.adapterFun('compact', function (opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    var self = this;
  
    opts = utils.clone(opts || {});
  
    self.get('_local/compaction')["catch"](function () {
      return false;
    }).then(function (doc) {
      if (typeof self._compact === 'function') {
        if (doc && doc.last_seq) {
          opts.last_seq = doc.last_seq;
        }
        return self._compact(opts, callback);
      }
  
    });
  });
  AbstractPouchDB.prototype._compact = function (opts, callback) {
    var self = this;
    var changesOpts = {
      returnDocs: false,
      last_seq: opts.last_seq || 0
    };
    var promises = [];
  
    function onChange(row) {
      promises.push(self.compactDocument(row.id, 0));
    }
    function onComplete(resp) {
      var lastSeq = resp.last_seq;
      Promise.all(promises).then(function () {
        return upsert(self, '_local/compaction', function deltaFunc(doc) {
          if (!doc.last_seq || doc.last_seq < lastSeq) {
            doc.last_seq = lastSeq;
            return doc;
          }
          return false; // somebody else got here first, don't update
        });
      }).then(function () {
        callback(null, {ok: true});
      })["catch"](callback);
    }
    self.changes(changesOpts)
      .on('change', onChange)
      .on('complete', onComplete)
      .on('error', callback);
  };
  /* Begin api wrappers. Specific functionality to storage belongs in the 
     _[method] */
  AbstractPouchDB.prototype.get =
    utils.adapterFun('get', function (id, opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    if (typeof id !== 'string') {
      return callback(errors.error(errors.INVALID_ID));
    }
    if (utils.isLocalId(id) && typeof this._getLocal === 'function') {
      return this._getLocal(id, callback);
    }
    var leaves = [], self = this;
  
    function finishOpenRevs() {
      var result = [];
      var count = leaves.length;
      if (!count) {
        return callback(null, result);
      }
      // order with open_revs is unspecified
      leaves.forEach(function (leaf) {
        self.get(id, {
          rev: leaf,
          revs: opts.revs,
          attachments: opts.attachments
        }, function (err, doc) {
          if (!err) {
            result.push({ok: doc});
          } else {
            result.push({missing: leaf});
          }
          count--;
          if (!count) {
            callback(null, result);
          }
        });
      });
    }
  
    if (opts.open_revs) {
      if (opts.open_revs === "all") {
        this._getRevisionTree(id, function (err, rev_tree) {
          if (err) {
            return callback(err);
          }
          leaves = merge.collectLeaves(rev_tree).map(function (leaf) {
            return leaf.rev;
          });
          finishOpenRevs();
        });
      } else {
        if (Array.isArray(opts.open_revs)) {
          leaves = opts.open_revs;
          for (var i = 0; i < leaves.length; i++) {
            var l = leaves[i];
            // looks like it's the only thing couchdb checks
            if (!(typeof(l) === "string" && /^\d+-/.test(l))) {
              return callback(errors.error(errors.INVALID_REV));
            }
          }
          finishOpenRevs();
        } else {
          return callback(errors.error(errors.UNKNOWN_ERROR,
            'function_clause'));
        }
      }
      return; // open_revs does not like other options
    }
  
    return this._get(id, opts, function (err, result) {
      opts = utils.clone(opts);
      if (err) {
        return callback(err);
      }
  
      var doc = result.doc;
      var metadata = result.metadata;
      var ctx = result.ctx;
  
      if (opts.conflicts) {
        var conflicts = merge.collectConflicts(metadata);
        if (conflicts.length) {
          doc._conflicts = conflicts;
        }
      }
  
      if (utils.isDeleted(metadata, doc._rev)) {
        doc._deleted = true;
      }
  
      if (opts.revs || opts.revs_info) {
        var paths = merge.rootToLeaf(metadata.rev_tree);
        var path = arrayFirst(paths, function (arr) {
          return arr.ids.map(function (x) { return x.id; })
            .indexOf(doc._rev.split('-')[1]) !== -1;
        });
  
        var indexOfRev = path.ids.map(function (x) {return x.id; })
          .indexOf(doc._rev.split('-')[1]) + 1;
        var howMany = path.ids.length - indexOfRev;
        path.ids.splice(indexOfRev, howMany);
        path.ids.reverse();
  
        if (opts.revs) {
          doc._revisions = {
            start: (path.pos + path.ids.length) - 1,
            ids: path.ids.map(function (rev) {
              return rev.id;
            })
          };
        }
        if (opts.revs_info) {
          var pos =  path.pos + path.ids.length;
          doc._revs_info = path.ids.map(function (rev) {
            pos--;
            return {
              rev: pos + '-' + rev.id,
              status: rev.opts.status
            };
          });
        }
      }
  
      if (opts.local_seq) {
        utils.info('The "local_seq" option is deprecated and will be removed');
        doc._local_seq = result.metadata.seq;
      }
  
      if (opts.attachments && doc._attachments) {
        var attachments = doc._attachments;
        var count = Object.keys(attachments).length;
        if (count === 0) {
          return callback(null, doc);
        }
        Object.keys(attachments).forEach(function (key) {
          this._getAttachment(attachments[key],
                              {encode: true, ctx: ctx}, function (err, data) {
            var att = doc._attachments[key];
            att.data = data;
            delete att.stub;
            delete att.length;
            if (!--count) {
              callback(null, doc);
            }
          });
        }, self);
      } else {
        if (doc._attachments) {
          for (var key in doc._attachments) {
            if (doc._attachments.hasOwnProperty(key)) {
              doc._attachments[key].stub = true;
            }
          }
        }
        callback(null, doc);
      }
    });
  });
  
  AbstractPouchDB.prototype.getAttachment =
    utils.adapterFun('getAttachment', function (docId, attachmentId, opts,
                                                callback) {
    var self = this;
    if (opts instanceof Function) {
      callback = opts;
      opts = {};
    }
    opts = utils.clone(opts);
    this._get(docId, opts, function (err, res) {
      if (err) {
        return callback(err);
      }
      if (res.doc._attachments && res.doc._attachments[attachmentId]) {
        opts.ctx = res.ctx;
        self._getAttachment(res.doc._attachments[attachmentId], opts, callback);
      } else {
        return callback(errors.error(errors.MISSING_DOC));
      }
    });
  });
  
  AbstractPouchDB.prototype.allDocs =
    utils.adapterFun('allDocs', function (opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    opts = utils.clone(opts);
    opts.skip = typeof opts.skip !== 'undefined' ? opts.skip : 0;
    if ('keys' in opts) {
      if (!Array.isArray(opts.keys)) {
        return callback(new TypeError('options.keys must be an array'));
      }
      var incompatibleOpt =
        ['startkey', 'endkey', 'key'].filter(function (incompatibleOpt) {
        return incompatibleOpt in opts;
      })[0];
      if (incompatibleOpt) {
        callback(errors.error(errors.QUERY_PARSE_ERROR,
          'Query parameter `' + incompatibleOpt +
          '` is not compatible with multi-get'
        ));
        return;
      }
      if (this.type() !== 'http') {
        return allDocsKeysQuery(this, opts, callback);
      }
    }
  
    return this._allDocs(opts, callback);
  });
  
  AbstractPouchDB.prototype.changes = function (opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    return new Changes(this, opts, callback);
  };
  
  AbstractPouchDB.prototype.close =
    utils.adapterFun('close', function (callback) {
    this._closed = true;
    return this._close(callback);
  });
  
  AbstractPouchDB.prototype.info = utils.adapterFun('info', function (callback) {
    var self = this;
    this._info(function (err, info) {
      if (err) {
        return callback(err);
      }
      // assume we know better than the adapter, unless it informs us
      info.db_name = info.db_name || self._db_name;
      info.auto_compaction = !!(self.auto_compaction && self.type() !== 'http');
      callback(null, info);
    });
  });
  
  AbstractPouchDB.prototype.id = utils.adapterFun('id', function (callback) {
    return this._id(callback);
  });
  
  AbstractPouchDB.prototype.type = function () {
    return (typeof this._type === 'function') ? this._type() : this.adapter;
  };
  
  AbstractPouchDB.prototype.bulkDocs =
    utils.adapterFun('bulkDocs', function (req, opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
  
    opts = utils.clone(opts);
  
    if (Array.isArray(req)) {
      req = {
        docs: req
      };
    }
  
    if (!req || !req.docs || !Array.isArray(req.docs)) {
      return callback(errors.error(errors.MISSING_BULK_DOCS));
    }
  
    for (var i = 0; i < req.docs.length; ++i) {
      if (typeof req.docs[i] !== 'object' || Array.isArray(req.docs[i])) {
        return callback(errors.error(errors.NOT_AN_OBJECT));
      }
    }
  
    req = utils.clone(req);
    if (!('new_edits' in opts)) {
      if ('new_edits' in req) {
        opts.new_edits = req.new_edits;
      } else {
        opts.new_edits = true;
      }
    }
  
    if (!opts.new_edits && this.type() !== 'http') {
      // ensure revisions of the same doc are sorted, so that
      // the local adapter processes them correctly (#2935)
      req.docs.sort(function (a, b) {
        var idCompare = utils.compare(a._id, b._id);
        if (idCompare !== 0) {
          return idCompare;
        }
        var aStart = a._revisions ? a._revisions.start : 0;
        var bStart = b._revisions ? b._revisions.start : 0;
        return utils.compare(aStart, bStart);
      });
    }
  
    req.docs.forEach(function (doc) {
      if (doc._deleted) {
        delete doc._attachments; // ignore atts for deleted docs
      }
    });
  
    return this._bulkDocs(req, opts, function (err, res) {
      if (err) {
        return callback(err);
      }
      if (!opts.new_edits) {
        // this is what couch does when new_edits is false
        res = res.filter(function (x) {
          return x.error;
        });
      }
      callback(null, res);
    });
  });
  
  AbstractPouchDB.prototype.registerDependentDatabase =
    utils.adapterFun('registerDependentDatabase', function (dependentDb,
                                                            callback) {
    var depDB = new this.constructor(dependentDb, this.__opts);
  
    function diffFun(doc) {
      doc.dependentDbs = doc.dependentDbs || {};
      if (doc.dependentDbs[dependentDb]) {
        return false; // no update required
      }
      doc.dependentDbs[dependentDb] = true;
      return doc;
    }
    upsert(this, '_local/_pouch_dependentDbs', diffFun, function (err) {
      if (err) {
        return callback(err);
      }
      return callback(null, {db: depDB});
    });
  });
  
  AbstractPouchDB.prototype.destroy =
    utils.adapterFun('destroy', function (callback) {
  
    var self = this;
    var usePrefix = 'use_prefix' in self ? self.use_prefix : true;
  
    function destroyDb() {
      // call destroy method of the particular adaptor
      self._destroy(function (err, resp) {
        if (err) {
          return callback(err);
        }
        self.emit('destroyed');
        callback(null, resp || { 'ok': true });
      });
    }
    self.get('_local/_pouch_dependentDbs', function (err, localDoc) {
      if (err) {
        if (err.status !== 404) {
          return callback(err);
        } else { // no dependencies
          return destroyDb();
        }
      }
      var dependentDbs = localDoc.dependentDbs;
      var PouchDB = self.constructor;
      var deletedMap = Object.keys(dependentDbs).map(function (name) {
        var trueName = usePrefix ?
          name.replace(new RegExp('^' + PouchDB.prefix), '') : name;
        return new PouchDB(trueName, self.__opts).destroy();
      });
      Promise.all(deletedMap).then(destroyDb, function (error) {
        callback(error);
      });
    });
  });
  
  },{"13":13,"19":19,"27":27,"31":31,"36":36,"40":40}],2:[function(_dereq_,module,exports){
  (function (process){
  "use strict";
  
  var CHANGES_BATCH_SIZE = 25;
  
  // according to http://stackoverflow.com/a/417184/680742,
  // the de factor URL length limit is 2000 characters.
  // but since most of our measurements don't take the full
  // URL into account, we fudge it a bit.
  // TODO: we could measure the full URL to enforce exactly 2000 chars
  var MAX_URL_LENGTH = 1800;
  
  var utils = _dereq_(36);
  var errors = _dereq_(19);
  var log = _dereq_(42)('pouchdb:http');
  var isBrowser = typeof process === 'undefined' || process.browser;
  var buffer = _dereq_(18);
  
  function encodeDocId(id) {
    if (/^_design/.test(id)) {
      return '_design/' + encodeURIComponent(id.slice(8));
    }
    if (/^_local/.test(id)) {
      return '_local/' + encodeURIComponent(id.slice(7));
    }
    return encodeURIComponent(id);
  }
  
  function preprocessAttachments(doc) {
    if (!doc._attachments || !Object.keys(doc._attachments)) {
      return utils.Promise.resolve();
    }
  
    return utils.Promise.all(Object.keys(doc._attachments).map(function (key) {
      var attachment = doc._attachments[key];
      if (attachment.data && typeof attachment.data !== 'string') {
        if (isBrowser) {
          return new utils.Promise(function (resolve) {
            utils.readAsBinaryString(attachment.data, function (binary) {
              attachment.data = utils.btoa(binary);
              resolve();
            });
          });
        } else {
          attachment.data = attachment.data.toString('base64');
        }
      }
    }));
  }
  
  // Get all the information you possibly can about the URI given by name and
  // return it as a suitable object.
  function getHost(name, opts) {
    // If the given name contains "http:"
    if (/http(s?):/.test(name)) {
      // Prase the URI into all its little bits
      var uri = utils.parseUri(name);
  
      // Store the fact that it is a remote URI
      uri.remote = true;
  
      // Store the user and password as a separate auth object
      if (uri.user || uri.password) {
        uri.auth = {username: uri.user, password: uri.password};
      }
  
      // Split the path part of the URI into parts using '/' as the delimiter
      // after removing any leading '/' and any trailing '/'
      var parts = uri.path.replace(/(^\/|\/$)/g, '').split('/');
  
      // Store the first part as the database name and remove it from the parts
      // array
      uri.db = parts.pop();
  
      // Restore the path by joining all the remaining parts (all the parts
      // except for the database name) with '/'s
      uri.path = parts.join('/');
      opts = opts || {};
      opts = utils.clone(opts);
      uri.headers = opts.headers || (opts.ajax && opts.ajax.headers) || {};
  
      if (opts.auth || uri.auth) {
        var nAuth = opts.auth || uri.auth;
        var token = utils.btoa(nAuth.username + ':' + nAuth.password);
        uri.headers.Authorization = 'Basic ' + token;
      }
  
      if (opts.headers) {
        uri.headers = opts.headers;
      }
  
      return uri;
    }
  
    // If the given name does not contain 'http:' then return a very basic object
    // with no host, the current path, the given name as the database name and no
    // username/password
    return {host: '', path: '/', db: name, auth: false};
  }
  
  // Generate a URL with the host data given by opts and the given path
  function genDBUrl(opts, path) {
    return genUrl(opts, opts.db + '/' + path);
  }
  
  // Generate a URL with the host data given by opts and the given path
  function genUrl(opts, path) {
    if (opts.remote) {
      // If the host already has a path, then we need to have a path delimiter
      // Otherwise, the path delimiter is the empty string
      var pathDel = !opts.path ? '' : '/';
  
      // If the host already has a path, then we need to have a path delimiter
      // Otherwise, the path delimiter is the empty string
      return opts.protocol + '://' + opts.host + ':' + opts.port + '/' +
             opts.path + pathDel + path;
    }
  
    return '/' + path;
  }
  
  // Implements the PouchDB API for dealing with CouchDB instances over HTTP
  function HttpPouch(opts, callback) {
    // The functions that will be publicly available for HttpPouch
    var api = this;
    api.getHost = opts.getHost ? opts.getHost : getHost;
  
    // Parse the URI given by opts.name into an easy-to-use object
    var host = api.getHost(opts.name, opts);
  
    // Generate the database URL based on the host
    var dbUrl = genDBUrl(host, '');
  
    api.getUrl = function () {return dbUrl; };
    api.getHeaders = function () {return utils.clone(host.headers); };
  
    var ajaxOpts = opts.ajax || {};
    opts = utils.clone(opts);
    function ajax(options, callback) {
      var reqOpts = utils.extend(true, utils.clone(ajaxOpts), options);
      log(reqOpts.method + ' ' + reqOpts.url);
      return utils.ajax(reqOpts, callback);
    }
  
    // Create a new CouchDB database based on the given opts
    var createDB = function () {
      ajax({headers: host.headers, method: 'PUT', url: dbUrl}, function (err) {
        // If we get an "Unauthorized" error
        if (err && err.status === 401) {
          // Test if the database already exists
          ajax({headers: host.headers, method: 'HEAD', url: dbUrl},
               function (err) {
            // If there is still an error
            if (err) {
              // Give the error to the callback to deal with
              callback(err);
            } else {
              // Continue as if there had been no errors
              callback(null, api);
            }
          });
          // If there were no errros or if the only error is "Precondition Failed"
          // (note: "Precondition Failed" occurs when we try to create a database
          // that already exists)
        } else if (!err || err.status === 412) {
          // Continue as if there had been no errors
          callback(null, api);
        } else {
          callback(err);
        }
      });
    };
  
    if (!opts.skipSetup) {
      ajax({headers: host.headers, method: 'GET', url: dbUrl}, function (err) {
        //check if the db exists
        if (err) {
          if (err.status === 404) {
            utils.explain404(
              'PouchDB is just detecting if the remote DB exists.');
            //if it doesn't, create it
            createDB();
          } else {
            callback(err);
          }
        } else {
          //go do stuff with the db
          callback(null, api);
        }
      });
    }
  
    api.type = function () {
      return 'http';
    };
  
    api.id = utils.adapterFun('id', function (callback) {
      ajax({
        headers: host.headers,
        method: 'GET',
        url: genUrl(host, '')
      }, function (err, result) {
        var uuid = (result && result.uuid) ?
          result.uuid + host.db : genDBUrl(host, '');
        callback(null, uuid);
      });
    });
  
    api.request = utils.adapterFun('request', function (options, callback) {
      options.headers = host.headers;
      options.url = genDBUrl(host, options.url);
      ajax(options, callback);
    });
  
    // Sends a POST request to the host calling the couchdb _compact function
    //    version: The version of CouchDB it is running
    api.compact = utils.adapterFun('compact', function (opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      opts = utils.clone(opts);
      ajax({
        headers: host.headers,
        url: genDBUrl(host, '_compact'),
        method: 'POST'
      }, function () {
        function ping() {
          api.info(function (err, res) {
            if (!res.compact_running) {
              callback(null, {ok: true});
            } else {
              setTimeout(ping, opts.interval || 200);
            }
          });
        }
        // Ping the http if it's finished compaction
        if (typeof callback === "function") {
          ping();
        }
      });
    });
  
    // Calls GET on the host, which gets back a JSON string containing
    //    couchdb: A welcome string
    //    version: The version of CouchDB it is running
    api._info = function (callback) {
      ajax({
        headers: host.headers,
        method: 'GET',
        url: genDBUrl(host, '')
      }, function (err, res) {
        if (err) {
          callback(err);
        } else {
          res.host = genDBUrl(host, '');
          callback(null, res);
        }
      });
    };
  
    // Get the document with the given id from the database given by host.
    // The id could be solely the _id in the database, or it may be a
    // _design/ID or _local/ID path
    api.get = utils.adapterFun('get', function (id, opts, callback) {
      // If no options were given, set the callback to the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      opts = utils.clone(opts);
      if (opts.auto_encode === undefined) {
        opts.auto_encode = true;
      }
  
      // List of parameters to add to the GET request
      var params = [];
  
      // If it exists, add the opts.revs value to the list of parameters.
      // If revs=true then the resulting JSON will include a field
      // _revisions containing an array of the revision IDs.
      if (opts.revs) {
        params.push('revs=true');
      }
  
      // If it exists, add the opts.revs_info value to the list of parameters.
      // If revs_info=true then the resulting JSON will include the field
      // _revs_info containing an array of objects in which each object
      // representing an available revision.
      if (opts.revs_info) {
        params.push('revs_info=true');
      }
  
      if (opts.local_seq) {
        params.push('local_seq=true');
      }
      // If it exists, add the opts.open_revs value to the list of parameters.
      // If open_revs=all then the resulting JSON will include all the leaf
      // revisions. If open_revs=["rev1", "rev2",...] then the resulting JSON
      // will contain an array of objects containing data of all revisions
      if (opts.open_revs) {
        if (opts.open_revs !== "all") {
          opts.open_revs = JSON.stringify(opts.open_revs);
        }
        params.push('open_revs=' + opts.open_revs);
      }
  
      // If it exists, add the opts.attachments value to the list of parameters.
      // If attachments=true the resulting JSON will include the base64-encoded
      // contents in the "data" property of each attachment.
      if (opts.attachments) {
        params.push('attachments=true');
      }
  
      // If it exists, add the opts.rev value to the list of parameters.
      // If rev is given a revision number then get the specified revision.
      if (opts.rev) {
        params.push('rev=' + opts.rev);
      }
  
      // If it exists, add the opts.conflicts value to the list of parameters.
      // If conflicts=true then the resulting JSON will include the field
      // _conflicts containing all the conflicting revisions.
      if (opts.conflicts) {
        params.push('conflicts=' + opts.conflicts);
      }
  
      // Format the list of parameters into a valid URI query string
      params = params.join('&');
      params = params === '' ? '' : '?' + params;
  
      if (opts.auto_encode) {
        id = encodeDocId(id);
      }
  
      // Set the options for the ajax call
      var options = {
        headers: host.headers,
        method: 'GET',
        url: genDBUrl(host, id + params)
      };
      var getRequestAjaxOpts = opts.ajax || {};
      utils.extend(true, options, getRequestAjaxOpts);
  
      // If the given id contains at least one '/' and the part before the '/'
      // is NOT "_design" and is NOT "_local"
      // OR
      // If the given id contains at least two '/' and the part before the first
      // '/' is "_design".
      // TODO This second condition seems strange since if parts[0] === '_design'
      // then we already know that parts[0] !== '_local'.
      var parts = id.split('/');
      if ((parts.length > 1 && parts[0] !== '_design' && parts[0] !== '_local') ||
          (parts.length > 2 && parts[0] === '_design' && parts[0] !== '_local')) {
        // Binary is expected back from the server
        options.binary = true;
      }
  
      // Get the document
      ajax(options, function (err, doc, xhr) {
        // If the document does not exist, send an error to the callback
        if (err) {
          return callback(err);
        }
  
        // Send the document to the callback
        callback(null, doc, xhr);
      });
    });
  
    // Delete the document given by doc from the database given by host.
    api.remove = utils.adapterFun('remove',
        function (docOrId, optsOrRev, opts, callback) {
      var doc;
      if (typeof optsOrRev === 'string') {
        // id, rev, opts, callback style
        doc = {
          _id: docOrId,
          _rev: optsOrRev
        };
        if (typeof opts === 'function') {
          callback = opts;
          opts = {};
        }
      } else {
        // doc, opts, callback style
        doc = docOrId;
        if (typeof optsOrRev === 'function') {
          callback = optsOrRev;
          opts = {};
        } else {
          callback = opts;
          opts = optsOrRev;
        }
      }
  
      var rev = (doc._rev || opts.rev);
  
      // Delete the document
      ajax({
        headers: host.headers,
        method: 'DELETE',
        url: genDBUrl(host, encodeDocId(doc._id)) + '?rev=' + rev
      }, callback);
    });
  
    function encodeAttachmentId(attachmentId) {
      return attachmentId.split("/").map(encodeURIComponent).join("/");
    }
  
    // Get the attachment
    api.getAttachment =
      utils.adapterFun('getAttachment', function (docId, attachmentId, opts,
                                                  callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      opts = utils.clone(opts);
      if (opts.auto_encode === undefined) {
        opts.auto_encode = true;
      }
      if (opts.auto_encode) {
        docId = encodeDocId(docId);
      }
      opts.auto_encode = false;
      api.get(docId + '/' + encodeAttachmentId(attachmentId), opts, callback);
    });
  
    // Remove the attachment given by the id and rev
    api.removeAttachment =
      utils.adapterFun('removeAttachment', function (docId, attachmentId, rev,
                                                     callback) {
  
      var url = genDBUrl(host, encodeDocId(docId) + '/' +
        encodeAttachmentId(attachmentId)) + '?rev=' + rev;
  
      ajax({
        headers: host.headers,
        method: 'DELETE',
        url: url
      }, callback);
    });
  
    // Add the attachment given by blob and its contentType property
    // to the document with the given id, the revision given by rev, and
    // add it to the database given by host.
    api.putAttachment =
      utils.adapterFun('putAttachment', function (docId, attachmentId, rev, blob,
                                                  type, callback) {
      if (typeof type === 'function') {
        callback = type;
        type = blob;
        blob = rev;
        rev = null;
      }
      if (typeof type === 'undefined') {
        type = blob;
        blob = rev;
        rev = null;
      }
      var id = encodeDocId(docId) + '/' + encodeAttachmentId(attachmentId);
      var url = genDBUrl(host, id);
      if (rev) {
        url += '?rev=' + rev;
      }
  
      if (typeof blob === 'string') {
        var binary;
        try {
          binary = utils.atob(blob);
        } catch (err) {
          // it's not base64-encoded, so throw error
          return callback(errors.error(errors.BAD_ARG,
                          'Attachments need to be base64 encoded'));
        }
        if (isBrowser) {
          blob = utils.createBlob([utils.fixBinary(binary)], {type: type});
        } else {
          blob = binary ? new buffer(binary, 'binary') : '';
        }
      }
  
      var opts = {
        headers: utils.clone(host.headers),
        method: 'PUT',
        url: url,
        processData: false,
        body: blob,
        timeout: 60000
      };
      opts.headers['Content-Type'] = type;
      // Add the attachment
      ajax(opts, callback);
    });
  
    // Add the document given by doc (in JSON string format) to the database
    // given by host. This fails if the doc has no _id field.
    api.put = utils.adapterFun('put', utils.getArguments(function (args) {
      var temp, temptype, opts;
      var doc = args.shift();
      var id = '_id' in doc;
      var callback = args.pop();
      if (typeof doc !== 'object' || Array.isArray(doc)) {
        return callback(errors.error(errors.NOT_AN_OBJECT));
      }
  
      doc = utils.clone(doc);
  
      preprocessAttachments(doc).then(function () {
        while (true) {
          temp = args.shift();
          temptype = typeof temp;
          if (temptype === "string" && !id) {
            doc._id = temp;
            id = true;
          } else if (temptype === "string" && id && !('_rev' in doc)) {
            doc._rev = temp;
          } else if (temptype === "object") {
            opts = utils.clone(temp);
          }
          if (!args.length) {
            break;
          }
        }
        opts = opts || {};
        var error = utils.invalidIdError(doc._id);
        if (error) {
          throw error;
        }
  
        // List of parameter to add to the PUT request
        var params = [];
  
        // If it exists, add the opts.new_edits value to the list of parameters.
        // If new_edits = false then the database will NOT assign this document a
        // new revision number
        if (opts && typeof opts.new_edits !== 'undefined') {
          params.push('new_edits=' + opts.new_edits);
        }
  
        // Format the list of parameters into a valid URI query string
        params = params.join('&');
        if (params !== '') {
          params = '?' + params;
        }
  
        // Add the document
        ajax({
          headers: host.headers,
          method: 'PUT',
          url: genDBUrl(host, encodeDocId(doc._id)) + params,
          body: doc
        }, function (err, res) {
          if (err) {
            return callback(err);
          }
          res.ok = true;
          callback(null, res);
        });
      })["catch"](callback);
  
    }));
  
    // Add the document given by doc (in JSON string format) to the database
    // given by host. This does not assume that doc is a new document 
    // (i.e. does not have a _id or a _rev field.)
    api.post = utils.adapterFun('post', function (doc, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      opts = utils.clone(opts);
      if (typeof doc !== 'object') {
        return callback(errors.error(errors.NOT_AN_OBJECT));
      }
      if (! ("_id" in doc)) {
        doc._id = utils.uuid();
      }
      api.put(doc, opts, function (err, res) {
        if (err) {
          return callback(err);
        }
        res.ok = true;
        callback(null, res);
      });
    });
  
    // Update/create multiple documents given by req in the database
    // given by host.
    api._bulkDocs = function (req, opts, callback) {
      // If opts.new_edits exists add it to the document data to be
      // send to the database.
      // If new_edits=false then it prevents the database from creating
      // new revision numbers for the documents. Instead it just uses
      // the old ones. This is used in database replication.
      if (typeof opts.new_edits !== 'undefined') {
        req.new_edits = opts.new_edits;
      }
  
      utils.Promise.all(req.docs.map(preprocessAttachments)).then(function () {
        // Update/create the documents
        ajax({
          headers: host.headers,
          method: 'POST',
          url: genDBUrl(host, '_bulk_docs'),
          body: req
        }, function (err, results) {
          if (err) {
            return callback(err);
          }
          results.forEach(function (result) {
            result.ok = true; // smooths out cloudant not adding this
          });
          callback(null, results);
        });
      })["catch"](callback);
    };
  
    // Get a listing of the documents in the database given
    // by host and ordered by increasing id.
    api.allDocs = utils.adapterFun('allDocs', function (opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      opts = utils.clone(opts);
      // List of parameters to add to the GET request
      var params = [];
      var body;
      var method = 'GET';
  
      if (opts.conflicts) {
        params.push('conflicts=true');
      }
  
      // If opts.descending is truthy add it to params
      if (opts.descending) {
        params.push('descending=true');
      }
  
      // If opts.include_docs exists, add the include_docs value to the
      // list of parameters.
      // If include_docs=true then include the associated document with each
      // result.
      if (opts.include_docs) {
        params.push('include_docs=true');
      }
  
      if (opts.attachments) {
        // added in CouchDB 1.6.0
        params.push('attachments=true');
      }
  
      if (opts.key) {
        params.push('key=' + encodeURIComponent(JSON.stringify(opts.key)));
      }
  
      // If opts.startkey exists, add the startkey value to the list of
      // parameters.
      // If startkey is given then the returned list of documents will
      // start with the document whose id is startkey.
      if (opts.startkey) {
        params.push('startkey=' +
          encodeURIComponent(JSON.stringify(opts.startkey)));
      }
  
      // If opts.endkey exists, add the endkey value to the list of parameters.
      // If endkey is given then the returned list of docuemnts will
      // end with the document whose id is endkey.
      if (opts.endkey) {
        params.push('endkey=' + encodeURIComponent(JSON.stringify(opts.endkey)));
      }
  
      if (typeof opts.inclusive_end !== 'undefined') {
        params.push('inclusive_end=' + !!opts.inclusive_end);
      }
  
      // If opts.limit exists, add the limit value to the parameter list.
      if (typeof opts.limit !== 'undefined') {
        params.push('limit=' + opts.limit);
      }
  
      if (typeof opts.skip !== 'undefined') {
        params.push('skip=' + opts.skip);
      }
  
      // Format the list of parameters into a valid URI query string
      params = params.join('&');
      if (params !== '') {
        params = '?' + params;
      }
  
      if (typeof opts.keys !== 'undefined') {
  
  
        var keysAsString =
          'keys=' + encodeURIComponent(JSON.stringify(opts.keys));
        if (keysAsString.length + params.length + 1 <= MAX_URL_LENGTH) {
          // If the keys are short enough, do a GET. we do this to work around
          // Safari not understanding 304s on POSTs (see issue #1239)
          params += (params.indexOf('?') !== -1 ? '&' : '?') + keysAsString;
        } else {
          // If keys are too long, issue a POST request to circumvent GET
          // query string limits
          // see http://wiki.apache.org/couchdb/HTTP_view_API#Querying_Options
          method = 'POST';
          body = JSON.stringify({keys: opts.keys});
        }
      }
  
      // Get the document listing
      ajax({
        headers: host.headers,
        method: method,
        url: genDBUrl(host, '_all_docs' + params),
        body: body
      }, callback);
    });
  
    // Get a list of changes made to documents in the database given by host.
    // TODO According to the README, there should be two other methods here,
    // api.changes.addListener and api.changes.removeListener.
    api._changes = function (opts) {
      // We internally page the results of a changes request, this means
      // if there is a large set of changes to be returned we can start
      // processing them quicker instead of waiting on the entire
      // set of changes to return and attempting to process them at once
      var batchSize = 'batch_size' in opts ? opts.batch_size : CHANGES_BATCH_SIZE;
  
      opts = utils.clone(opts);
      opts.timeout = opts.timeout || 30 * 1000;
  
      // We give a 5 second buffer for CouchDB changes to respond with
      // an ok timeout
      var params = { timeout: opts.timeout - (5 * 1000) };
      var limit = (typeof opts.limit !== 'undefined') ? opts.limit : false;
      if (limit === 0) {
        limit = 1;
      }
      var returnDocs;
      if ('returnDocs' in opts) {
        returnDocs = opts.returnDocs;
      } else {
        returnDocs = true;
      }
      //
      var leftToFetch = limit;
  
      if (opts.style) {
        params.style = opts.style;
      }
  
      if (opts.include_docs || opts.filter && typeof opts.filter === 'function') {
        params.include_docs = true;
      }
  
      if (opts.attachments) {
        params.attachments = true;
      }
  
      if (opts.continuous) {
        params.feed = 'longpoll';
      }
  
      if (opts.conflicts) {
        params.conflicts = true;
      }
  
      if (opts.descending) {
        params.descending = true;
      }
  
      if (opts.filter && typeof opts.filter === 'string') {
        params.filter = opts.filter;
        if (opts.filter === '_view' &&
            opts.view &&
            typeof opts.view === 'string') {
          params.view = opts.view;
        }
      }
  
      // If opts.query_params exists, pass it through to the changes request.
      // These parameters may be used by the filter on the source database.
      if (opts.query_params && typeof opts.query_params === 'object') {
        for (var param_name in opts.query_params) {
          if (opts.query_params.hasOwnProperty(param_name)) {
            params[param_name] = opts.query_params[param_name];
          }
        }
      }
  
      var method = 'GET';
      var body;
  
      if (opts.doc_ids) {
        // set this automagically for the user; it's annoying that couchdb
        // requires both a "filter" and a "doc_ids" param.
        params.filter = '_doc_ids';
  
        var docIdsJson = JSON.stringify(opts.doc_ids);
  
        if (docIdsJson.length < MAX_URL_LENGTH) {
          params.doc_ids = docIdsJson;
        } else {
          // anything greater than ~2000 is unsafe for gets, so
          // use POST instead
          method = 'POST';
          body = {doc_ids: opts.doc_ids };
        }
      }
  
      if (opts.continuous && api._useSSE) {
        return  api.sse(opts, params, returnDocs);
      }
      var xhr;
      var lastFetchedSeq;
  
      // Get all the changes starting wtih the one immediately after the
      // sequence number given by since.
      var fetch = function (since, callback) {
        if (opts.aborted) {
          return;
        }
        params.since = since;
        if (typeof params.since === "object") {
          params.since = JSON.stringify(params.since);
        }
  
        if (opts.descending) {
          if (limit) {
            params.limit = leftToFetch;
          }
        } else {
          params.limit = (!limit || leftToFetch > batchSize) ?
            batchSize : leftToFetch;
        }
  
        var paramStr = '?' + Object.keys(params).map(function (k) {
          return k + '=' + params[k];
        }).join('&');
  
        // Set the options for the ajax call
        var xhrOpts = {
          headers: host.headers,
          method: method,
          url: genDBUrl(host, '_changes' + paramStr),
          // _changes can take a long time to generate, especially when filtered
          timeout: opts.timeout,
          body: body
        };
        lastFetchedSeq = since;
  
        if (opts.aborted) {
          return;
        }
  
        // Get the changes
        xhr = ajax(xhrOpts, callback);
      };
  
      // If opts.since exists, get all the changes from the sequence
      // number given by opts.since. Otherwise, get all the changes
      // from the sequence number 0.
      var fetchTimeout = 10;
      var fetchRetryCount = 0;
  
      var results = {results: []};
  
      var fetched = function (err, res) {
        if (opts.aborted) {
          return;
        }
        var raw_results_length = 0;
        // If the result of the ajax call (res) contains changes (res.results)
        if (res && res.results) {
          raw_results_length = res.results.length;
          results.last_seq = res.last_seq;
          // For each change
          var req = {};
          req.query = opts.query_params;
          res.results = res.results.filter(function (c) {
            leftToFetch--;
            var ret = utils.filterChange(opts)(c);
            if (ret) {
              if (returnDocs) {
                results.results.push(c);
              }
              utils.call(opts.onChange, c);
            }
            return ret;
          });
        } else if (err) {
          // In case of an error, stop listening for changes and call
          // opts.complete
          opts.aborted = true;
          utils.call(opts.complete, err);
          return;
        }
  
        // The changes feed may have timed out with no results
        // if so reuse last update sequence
        if (res && res.last_seq) {
          lastFetchedSeq = res.last_seq;
        }
  
        var finished = (limit && leftToFetch <= 0) ||
          (res && raw_results_length < batchSize) ||
          (opts.descending);
  
        if ((opts.continuous && !(limit && leftToFetch <= 0)) || !finished) {
          // Increase retry delay exponentially as long as errors persist
          if (err) {
            fetchRetryCount += 1;
          } else {
            fetchRetryCount = 0;
          }
          var timeoutMultiplier = 1 << fetchRetryCount;
          var retryWait = fetchTimeout * timeoutMultiplier;
          var maximumWait = opts.maximumWait || 30000;
  
          if (retryWait > maximumWait) {
            utils.call(opts.complete, err || errors.error(errors.UNKNOWN_ERROR));
            return;
          }
  
          // Queue a call to fetch again with the newest sequence number
          setTimeout(function () { fetch(lastFetchedSeq, fetched); }, retryWait);
        } else {
          // We're done, call the callback
          utils.call(opts.complete, null, results);
        }
      };
  
      fetch(opts.since || 0, fetched);
  
      // Return a method to cancel this method from processing any more
      return {
        cancel: function () {
          opts.aborted = true;
          if (xhr) {
            xhr.abort();
          }
        }
      };
    };
  
    api.sse = function (opts, params, returnDocs) {
      params.feed = 'eventsource';
      params.since = opts.since || 0;
      params.limit = opts.limit;
      delete params.timeout;
      var paramStr = '?' + Object.keys(params).map(function (k) {
        return k + '=' + params[k];
      }).join('&');
      var url = genDBUrl(host, '_changes' + paramStr);
      var source = new EventSource(url);
      var results = {
        results: [],
        last_seq: false
      };
      var dispatched = false;
      var open = false;
      source.addEventListener('message', msgHandler, false);
      source.onopen = function () {
        open = true;
      };
      source.onerror = errHandler;
      return {
        cancel: function () {
          if (dispatched) {
            return dispatched.cancel();
          }
          source.removeEventListener('message', msgHandler, false);
          source.close();
        }
      };
      function msgHandler(e) {
        var data = JSON.parse(e.data);
        if (returnDocs) {
          results.results.push(data);
        }
        results.last_seq = data.seq;
        utils.call(opts.onChange, data);
      }
      function errHandler(err) {
        source.removeEventListener('message', msgHandler, false);
        if (open === false) {
          // errored before it opened
          // likely doesn't support EventSource
          api._useSSE = false;
          dispatched = api._changes(opts);
          return;
        }
        source.close();
        utils.call(opts.complete, err);
      }
      
    };
  
    api._useSSE = false;
    // Currently disabled due to failing chrome tests in saucelabs
    // api._useSSE = typeof global.EventSource === 'function';
  
    // Given a set of document/revision IDs (given by req), tets the subset of
    // those that do NOT correspond to revisions stored in the database.
    // See http://wiki.apache.org/couchdb/HttpPostRevsDiff
    api.revsDiff = utils.adapterFun('revsDiff', function (req, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      // Get the missing document/revision IDs
      ajax({
        headers: host.headers,
        method: 'POST',
        url: genDBUrl(host, '_revs_diff'),
        body: JSON.stringify(req)
      }, callback);
    });
  
    api._close = function (callback) {
      callback();
    };
  
    api._destroy = function (callback) {
      ajax({
        url: genDBUrl(host, ''),
        method: 'DELETE',
        headers: host.headers
      }, function (err, resp) {
        if (err) {
          api.emit('error', err);
          callback(err);
        } else {
          api.emit('destroyed');
          api.constructor.emit('destroyed', opts.name);
          callback(null, resp);
        }
      });
    };
  }
  
  // HttpPouch is a valid adapter.
  HttpPouch.valid = function () {
    return true;
  };
  
  module.exports = HttpPouch;
  
  }).call(this,_dereq_(41))
  },{"18":18,"19":19,"36":36,"41":41,"42":42}],3:[function(_dereq_,module,exports){
  'use strict';
  
  var merge = _dereq_(31);
  var errors = _dereq_(19);
  var idbUtils = _dereq_(7);
  var idbConstants = _dereq_(6);
  
  var ATTACH_STORE = idbConstants.ATTACH_STORE;
  var BY_SEQ_STORE = idbConstants.BY_SEQ_STORE;
  var DOC_STORE = idbConstants.DOC_STORE;
  
  var decodeDoc = idbUtils.decodeDoc;
  var decodeMetadata = idbUtils.decodeMetadata;
  var fetchAttachmentsIfNecessary = idbUtils.fetchAttachmentsIfNecessary;
  var postProcessAttachments = idbUtils.postProcessAttachments;
  var openTransactionSafely = idbUtils.openTransactionSafely;
  
  function createKeyRange(start, end, inclusiveEnd, key, descending) {
    try {
      if (start && end) {
        if (descending) {
          return IDBKeyRange.bound(end, start, !inclusiveEnd, false);
        } else {
          return IDBKeyRange.bound(start, end, false, !inclusiveEnd);
        }
      } else if (start) {
        if (descending) {
          return IDBKeyRange.upperBound(start);
        } else {
          return IDBKeyRange.lowerBound(start);
        }
      } else if (end) {
        if (descending) {
          return IDBKeyRange.lowerBound(end, !inclusiveEnd);
        } else {
          return IDBKeyRange.upperBound(end, !inclusiveEnd);
        }
      } else if (key) {
        return IDBKeyRange.only(key);
      }
    } catch (e) {
      return {error: e};
    }
    return null;
  }
  
  function handleKeyRangeError(api, opts, err, callback) {
    if (err.name === "DataError" && err.code === 0) {
      // data error, start is less than end
      return callback(null, {
        total_rows: api._meta.docCount,
        offset: opts.skip,
        rows: []
      });
    }
    callback(errors.error(errors.IDB_ERROR, err.name, err.message));
  }
  
  function idbAllDocs(opts, api, idb, callback) {
  
    function allDocsQuery(opts, callback) {
      var start = 'startkey' in opts ? opts.startkey : false;
      var end = 'endkey' in opts ? opts.endkey : false;
      var key = 'key' in opts ? opts.key : false;
      var skip = opts.skip || 0;
      var limit = typeof opts.limit === 'number' ? opts.limit : -1;
      var inclusiveEnd = opts.inclusive_end !== false;
      var descending = 'descending' in opts && opts.descending ? 'prev' : null;
  
      var keyRange = createKeyRange(start, end, inclusiveEnd, key, descending);
      if (keyRange && keyRange.error) {
        return handleKeyRangeError(api, opts, keyRange.error, callback);
      }
  
      var stores = [DOC_STORE, BY_SEQ_STORE];
  
      if (opts.attachments) {
        stores.push(ATTACH_STORE);
      }
      var txnResult = openTransactionSafely(idb, stores, 'readonly');
      if (txnResult.error) {
        return callback(txnResult.error);
      }
      var txn = txnResult.txn;
      var docStore = txn.objectStore(DOC_STORE);
      var seqStore = txn.objectStore(BY_SEQ_STORE);
      var cursor = descending ?
        docStore.openCursor(keyRange, descending) :
        docStore.openCursor(keyRange);
      var docIdRevIndex = seqStore.index('_doc_id_rev');
      var results = [];
      var docCount = 0;
  
      // if the user specifies include_docs=true, then we don't
      // want to block the main cursor while we're fetching the doc
      function fetchDocAsynchronously(metadata, row, winningRev) {
        var key = metadata.id + "::" + winningRev;
        docIdRevIndex.get(key).onsuccess =  function onGetDoc(e) {
          row.doc = decodeDoc(e.target.result);
          if (opts.conflicts) {
            row.doc._conflicts = merge.collectConflicts(metadata);
          }
          fetchAttachmentsIfNecessary(row.doc, opts, txn);
        };
      }
  
      function allDocsInner(cursor, winningRev, metadata) {
        var row = {
          id: metadata.id,
          key: metadata.id,
          value: {
            rev: winningRev
          }
        };
        var deleted = metadata.deleted;
        if (opts.deleted === 'ok') {
          results.push(row);
          // deleted docs are okay with "keys" requests
          if (deleted) {
            row.value.deleted = true;
            row.doc = null;
          } else if (opts.include_docs) {
            fetchDocAsynchronously(metadata, row, winningRev);
          }
        } else if (!deleted && skip-- <= 0) {
          results.push(row);
          if (opts.include_docs) {
            fetchDocAsynchronously(metadata, row, winningRev);
          }
          if (--limit === 0) {
            return;
          }
        }
        cursor["continue"]();
      }
  
      function onGetCursor(e) {
        docCount = api._meta.docCount; // do this within the txn for consistency
        var cursor = e.target.result;
        if (!cursor) {
          return;
        }
        var metadata = decodeMetadata(cursor.value);
        var winningRev = metadata.winningRev;
  
        allDocsInner(cursor, winningRev, metadata);
      }
  
      function onResultsReady() {
        callback(null, {
          total_rows: docCount,
          offset: opts.skip,
          rows: results
        });
      }
  
      function onTxnComplete() {
        if (opts.attachments) {
          postProcessAttachments(results).then(onResultsReady);
        } else {
          onResultsReady();
        }
      }
  
      txn.oncomplete = onTxnComplete;
      cursor.onsuccess = onGetCursor;
    }
  
    function allDocs(opts, callback) {
  
      if (opts.limit === 0) {
        return callback(null, {
          total_rows: api._meta.docCount,
          offset: opts.skip,
          rows: []
        });
      }
      allDocsQuery(opts, callback);
    }
  
    allDocs(opts, callback);
  }
  
  module.exports = idbAllDocs;
  },{"19":19,"31":31,"6":6,"7":7}],4:[function(_dereq_,module,exports){
  'use strict';
  
  var utils = _dereq_(36);
  var idbConstants = _dereq_(6);
  var DETECT_BLOB_SUPPORT_STORE = idbConstants.DETECT_BLOB_SUPPORT_STORE;
  
  //
  // Detect blob support. Chrome didn't support it until version 38.
  // In version 37 they had a broken version where PNGs (and possibly
  // other binary types) aren't stored correctly, because when you fetch
  // them, the content type is always null.
  //
  // Furthermore, they have some outstanding bugs where blobs occasionally
  // are read by FileReader as null, or by ajax as 404s.
  //
  // Sadly we use the 404 bug to detect the FileReader bug, so if they
  // get fixed independently and released in different versions of Chrome,
  // then the bug could come back. So it's worthwhile to watch these issues:
  // 404 bug: https://code.google.com/p/chromium/issues/detail?id=447916
  // FileReader bug: https://code.google.com/p/chromium/issues/detail?id=447836
  //
  function checkBlobSupport(txn, idb) {
    return new utils.Promise(function (resolve, reject) {
      var blob = utils.createBlob([''], {type: 'image/png'});
      txn.objectStore(DETECT_BLOB_SUPPORT_STORE).put(blob, 'key');
      txn.oncomplete = function () {
        // have to do it in a separate transaction, else the correct
        // content type is always returned
        var blobTxn = idb.transaction([DETECT_BLOB_SUPPORT_STORE],
          'readwrite');
        var getBlobReq = blobTxn.objectStore(
          DETECT_BLOB_SUPPORT_STORE).get('key');
        getBlobReq.onerror = reject;
        getBlobReq.onsuccess = function (e) {
  
          var storedBlob = e.target.result;
          var url = URL.createObjectURL(storedBlob);
  
          utils.ajax({
            url: url,
            cache: true,
            binary: true
          }, function (err, res) {
            if (err && err.status === 405) {
              // firefox won't let us do that. but firefox doesn't
              // have the blob type bug that Chrome does, so that's ok
              resolve(true);
            } else {
              resolve(!!(res && res.type === 'image/png'));
              if (err && err.status === 404) {
                utils.explain404('PouchDB is just detecting blob URL support.');
              }
            }
            URL.revokeObjectURL(url);
          });
        };
      };
    })["catch"](function () {
      return false; // error, so assume unsupported
    });
  }
  
  module.exports = checkBlobSupport;
  },{"36":36,"6":6}],5:[function(_dereq_,module,exports){
  'use strict';
  
  var utils = _dereq_(36);
  var errors = _dereq_(19);
  var idbUtils = _dereq_(7);
  var idbConstants = _dereq_(6);
  
  var ATTACH_AND_SEQ_STORE = idbConstants.ATTACH_AND_SEQ_STORE;
  var ATTACH_STORE = idbConstants.ATTACH_STORE;
  var BY_SEQ_STORE = idbConstants.BY_SEQ_STORE;
  var DOC_STORE = idbConstants.DOC_STORE;
  var LOCAL_STORE = idbConstants.LOCAL_STORE;
  var META_STORE = idbConstants.META_STORE;
  
  var compactRevs = idbUtils.compactRevs;
  var decodeMetadata = idbUtils.decodeMetadata;
  var encodeMetadata = idbUtils.encodeMetadata;
  var idbError = idbUtils.idbError;
  var openTransactionSafely = idbUtils.openTransactionSafely;
  
  function idbBulkDocs(req, opts, api, idb, Changes, callback) {
    var docInfos = req.docs;
    var txn;
    var docStore;
    var bySeqStore;
    var attachStore;
    var attachAndSeqStore;
    var docInfoError;
    var docCountDelta = 0;
  
    for (var i = 0, len = docInfos.length; i < len; i++) {
      var doc = docInfos[i];
      if (doc._id && utils.isLocalId(doc._id)) {
        continue;
      }
      doc = docInfos[i] = utils.parseDoc(doc, opts.new_edits);
      if (doc.error && !docInfoError) {
        docInfoError = doc;
      }
    }
  
    if (docInfoError) {
      return callback(docInfoError);
    }
  
    var results = new Array(docInfos.length);
    var fetchedDocs = new utils.Map();
    var preconditionErrored = false;
    var blobType = api._meta.blobSupport ? 'blob' : 'base64';
  
    utils.preprocessAttachments(docInfos, blobType, function (err) {
      if (err) {
        return callback(err);
      }
      startTransaction();
    });
  
    function startTransaction() {
  
      var stores = [
        DOC_STORE, BY_SEQ_STORE,
        ATTACH_STORE, META_STORE,
        LOCAL_STORE, ATTACH_AND_SEQ_STORE
      ];
      var txnResult = openTransactionSafely(idb, stores, 'readwrite');
      if (txnResult.error) {
        return callback(txnResult.error);
      }
      txn = txnResult.txn;
      txn.onerror = idbError(callback);
      txn.ontimeout = idbError(callback);
      txn.oncomplete = complete;
      docStore = txn.objectStore(DOC_STORE);
      bySeqStore = txn.objectStore(BY_SEQ_STORE);
      attachStore = txn.objectStore(ATTACH_STORE);
      attachAndSeqStore = txn.objectStore(ATTACH_AND_SEQ_STORE);
  
      verifyAttachments(function (err) {
        if (err) {
          preconditionErrored = true;
          return callback(err);
        }
        fetchExistingDocs();
      });
    }
  
    function processDocs() {
  
      utils.processDocs(docInfos, api, fetchedDocs, txn, results,
        writeDoc, opts);
    }
  
    function fetchExistingDocs() {
  
      if (!docInfos.length) {
        return;
      }
  
      var numFetched = 0;
  
      function checkDone() {
        if (++numFetched === docInfos.length) {
          processDocs();
        }
      }
  
      function readMetadata(event) {
        var metadata = decodeMetadata(event.target.result);
  
        if (metadata) {
          fetchedDocs.set(metadata.id, metadata);
        }
        checkDone();
      }
  
      for (var i = 0, len = docInfos.length; i < len; i++) {
        var docInfo = docInfos[i];
        if (docInfo._id && utils.isLocalId(docInfo._id)) {
          checkDone(); // skip local docs
          continue;
        }
        var req = docStore.get(docInfo.metadata.id);
        req.onsuccess = readMetadata;
      }
    }
  
    function complete() {
      if (preconditionErrored) {
        return;
      }
  
      Changes.notify(api._meta.name);
      api._meta.docCount += docCountDelta;
      callback(null, results);
    }
  
    function verifyAttachment(digest, callback) {
  
      var req = attachStore.get(digest);
      req.onsuccess = function (e) {
        if (!e.target.result) {
          var err = errors.error(errors.MISSING_STUB,
            'unknown stub attachment with digest ' +
            digest);
          err.status = 412;
          callback(err);
        } else {
          callback();
        }
      };
    }
  
    function verifyAttachments(finish) {
  
  
      var digests = [];
      docInfos.forEach(function (docInfo) {
        if (docInfo.data && docInfo.data._attachments) {
          Object.keys(docInfo.data._attachments).forEach(function (filename) {
            var att = docInfo.data._attachments[filename];
            if (att.stub) {
              digests.push(att.digest);
            }
          });
        }
      });
      if (!digests.length) {
        return finish();
      }
      var numDone = 0;
      var err;
  
      function checkDone() {
        if (++numDone === digests.length) {
          finish(err);
        }
      }
      digests.forEach(function (digest) {
        verifyAttachment(digest, function (attErr) {
          if (attErr && !err) {
            err = attErr;
          }
          checkDone();
        });
      });
    }
  
    function writeDoc(docInfo, winningRev, winningRevIsDeleted, newRevIsDeleted,
                      isUpdate, delta, resultsIdx, callback) {
  
      docCountDelta += delta;
  
      var doc = docInfo.data;
      doc._id = docInfo.metadata.id;
      doc._rev = docInfo.metadata.rev;
  
      if (newRevIsDeleted) {
        doc._deleted = true;
      }
  
      var hasAttachments = doc._attachments &&
        Object.keys(doc._attachments).length;
      if (hasAttachments) {
        return writeAttachments(docInfo, winningRev, winningRevIsDeleted,
          isUpdate, resultsIdx, callback);
      }
  
      finishDoc(docInfo, winningRev, winningRevIsDeleted,
        isUpdate, resultsIdx, callback);
    }
  
    function autoCompact(docInfo) {
  
      var revsToDelete = utils.compactTree(docInfo.metadata);
      compactRevs(revsToDelete, docInfo.metadata.id, txn);
    }
  
    function finishDoc(docInfo, winningRev, winningRevIsDeleted,
                       isUpdate, resultsIdx, callback) {
  
      var doc = docInfo.data;
      var metadata = docInfo.metadata;
  
      doc._doc_id_rev = metadata.id + '::' + metadata.rev;
      delete doc._id;
      delete doc._rev;
  
      function afterPutDoc(e) {
        if (isUpdate && api.auto_compaction) {
          autoCompact(docInfo);
        }
        metadata.seq = e.target.result;
        // Current _rev is calculated from _rev_tree on read
        delete metadata.rev;
        var metadataToStore = encodeMetadata(metadata, winningRev,
          winningRevIsDeleted);
        var metaDataReq = docStore.put(metadataToStore);
        metaDataReq.onsuccess = afterPutMetadata;
      }
  
      function afterPutDocError(e) {
        // ConstraintError, need to update, not put (see #1638 for details)
        e.preventDefault(); // avoid transaction abort
        e.stopPropagation(); // avoid transaction onerror
        var index = bySeqStore.index('_doc_id_rev');
        var getKeyReq = index.getKey(doc._doc_id_rev);
        getKeyReq.onsuccess = function (e) {
          var putReq = bySeqStore.put(doc, e.target.result);
          putReq.onsuccess = afterPutDoc;
        };
      }
  
      function afterPutMetadata() {
        results[resultsIdx] = {
          ok: true,
          id: metadata.id,
          rev: winningRev
        };
        fetchedDocs.set(docInfo.metadata.id, docInfo.metadata);
        insertAttachmentMappings(docInfo, metadata.seq, callback);
      }
  
      var putReq = bySeqStore.put(doc);
  
      putReq.onsuccess = afterPutDoc;
      putReq.onerror = afterPutDocError;
    }
  
    function writeAttachments(docInfo, winningRev, winningRevIsDeleted,
                              isUpdate, resultsIdx, callback) {
  
  
      var doc = docInfo.data;
  
      var numDone = 0;
      var attachments = Object.keys(doc._attachments);
  
      function collectResults() {
        if (numDone === attachments.length) {
          finishDoc(docInfo, winningRev, winningRevIsDeleted,
            isUpdate, resultsIdx, callback);
        }
      }
  
      function attachmentSaved() {
        numDone++;
        collectResults();
      }
  
      attachments.forEach(function (key) {
        var att = docInfo.data._attachments[key];
        if (!att.stub) {
          var data = att.data;
          delete att.data;
          var digest = att.digest;
          saveAttachment(digest, data, attachmentSaved);
        } else {
          numDone++;
          collectResults();
        }
      });
    }
  
    // map seqs to attachment digests, which
    // we will need later during compaction
    function insertAttachmentMappings(docInfo, seq, callback) {
  
      var attsAdded = 0;
      var attsToAdd = Object.keys(docInfo.data._attachments || {});
  
      if (!attsToAdd.length) {
        return callback();
      }
  
      function checkDone() {
        if (++attsAdded === attsToAdd.length) {
          callback();
        }
      }
  
      function add(att) {
        var digest = docInfo.data._attachments[att].digest;
        var req = attachAndSeqStore.put({
          seq: seq,
          digestSeq: digest + '::' + seq
        });
  
        req.onsuccess = checkDone;
        req.onerror = function (e) {
          // this callback is for a constaint error, which we ignore
          // because this docid/rev has already been associated with
          // the digest (e.g. when new_edits == false)
          e.preventDefault(); // avoid transaction abort
          e.stopPropagation(); // avoid transaction onerror
          checkDone();
        };
      }
      for (var i = 0; i < attsToAdd.length; i++) {
        add(attsToAdd[i]); // do in parallel
      }
    }
  
    function saveAttachment(digest, data, callback) {
  
  
      var getKeyReq = attachStore.count(digest);
      getKeyReq.onsuccess = function(e) {
        var count = e.target.result;
        if (count) {
          return callback(); // already exists
        }
        var newAtt = {
          digest: digest,
          body: data
        };
        var putReq = attachStore.put(newAtt);
        putReq.onsuccess = callback;
      };
    }
  }
  
  module.exports = idbBulkDocs;
  },{"19":19,"36":36,"6":6,"7":7}],6:[function(_dereq_,module,exports){
  'use strict';
  
  // IndexedDB requires a versioned database structure, so we use the
  // version here to manage migrations.
  exports.ADAPTER_VERSION = 5;
  
  // The object stores created for each database
  // DOC_STORE stores the document meta data, its revision history and state
  // Keyed by document id
  exports. DOC_STORE = 'document-store';
  // BY_SEQ_STORE stores a particular version of a document, keyed by its
  // sequence id
  exports.BY_SEQ_STORE = 'by-sequence';
  // Where we store attachments
  exports.ATTACH_STORE = 'attach-store';
  // Where we store many-to-many relations
  // between attachment digests and seqs
  exports.ATTACH_AND_SEQ_STORE = 'attach-seq-store';
  
  // Where we store database-wide meta data in a single record
  // keyed by id: META_STORE
  exports.META_STORE = 'meta-store';
  // Where we store local documents
  exports.LOCAL_STORE = 'local-store';
  // Where we detect blob support
  exports.DETECT_BLOB_SUPPORT_STORE = 'detect-blob-support';
  },{}],7:[function(_dereq_,module,exports){
  (function (process){
  'use strict';
  
  var errors = _dereq_(19);
  var utils = _dereq_(36);
  var constants = _dereq_(6);
  
  function tryCode(fun, that, args) {
    try {
      fun.apply(that, args);
    } catch (err) { // shouldn't happen
      if (typeof PouchDB !== 'undefined') {
        PouchDB.emit('error', err);
      }
    }
  }
  
  exports.taskQueue = {
    running: false,
    queue: []
  };
  
  exports.applyNext = function () {
    if (exports.taskQueue.running || !exports.taskQueue.queue.length) {
      return;
    }
    exports.taskQueue.running = true;
    var item = exports.taskQueue.queue.shift();
    item.action(function (err, res) {
      tryCode(item.callback, this, [err, res]);
      exports.taskQueue.running = false;
      process.nextTick(exports.applyNext);
    });
  };
  
  exports.idbError = function (callback) {
    return function (event) {
      var message = (event.target && event.target.error &&
        event.target.error.name) || event.target;
      callback(errors.error(errors.IDB_ERROR, message, event.type));
    };
  };
  
  // Unfortunately, the metadata has to be stringified
  // when it is put into the database, because otherwise
  // IndexedDB can throw errors for deeply-nested objects.
  // Originally we just used JSON.parse/JSON.stringify; now
  // we use this custom vuvuzela library that avoids recursion.
  // If we could do it all over again, we'd probably use a
  // format for the revision trees other than JSON.
  exports.encodeMetadata = function (metadata, winningRev, deleted) {
    return {
      data: utils.safeJsonStringify(metadata),
      winningRev: winningRev,
      deletedOrLocal: deleted ? '1' : '0',
      seq: metadata.seq, // highest seq for this doc
      id: metadata.id
    };
  };
  
  exports.decodeMetadata = function (storedObject) {
    if (!storedObject) {
      return null;
    }
    var metadata = utils.safeJsonParse(storedObject.data);
    metadata.winningRev = storedObject.winningRev;
    metadata.deleted = storedObject.deletedOrLocal === '1';
    metadata.seq = storedObject.seq;
    return metadata;
  };
  
  // read the doc back out from the database. we don't store the
  // _id or _rev because we already have _doc_id_rev.
  exports.decodeDoc = function (doc) {
    if (!doc) {
      return doc;
    }
    var idx = utils.lastIndexOf(doc._doc_id_rev, ':');
    doc._id = doc._doc_id_rev.substring(0, idx - 1);
    doc._rev = doc._doc_id_rev.substring(idx + 1);
    delete doc._doc_id_rev;
    return doc;
  };
  
  // Read a blob from the database, encoding as necessary
  // and translating from base64 if the IDB doesn't support
  // native Blobs
  exports.readBlobData = function (body, type, encode, callback) {
    if (encode) {
      if (!body) {
        callback('');
      } else if (typeof body !== 'string') { // we have blob support
        utils.readAsBinaryString(body, function (binary) {
          callback(utils.btoa(binary));
        });
      } else { // no blob support
        callback(body);
      }
    } else {
      if (!body) {
        callback(utils.createBlob([''], {type: type}));
      } else if (typeof body !== 'string') { // we have blob support
        callback(body);
      } else { // no blob support
        body = utils.fixBinary(atob(body));
        callback(utils.createBlob([body], {type: type}));
      }
    }
  };
  
  exports.fetchAttachmentsIfNecessary = function (doc, opts, txn, cb) {
    var attachments = Object.keys(doc._attachments || {});
    if (!attachments.length) {
      return cb && cb();
    }
    var numDone = 0;
  
    function checkDone() {
      if (++numDone === attachments.length && cb) {
        cb();
      }
    }
  
    function fetchAttachment(doc, att) {
      var attObj = doc._attachments[att];
      var digest = attObj.digest;
      var req = txn.objectStore(constants.ATTACH_STORE).get(digest);
      req.onsuccess = function (e) {
        attObj.body = e.target.result.body;
        checkDone();
      };
    }
  
    attachments.forEach(function (att) {
      if (opts.attachments && opts.include_docs) {
        fetchAttachment(doc, att);
      } else {
        doc._attachments[att].stub = true;
        checkDone();
      }
    });
  };
  
  // IDB-specific postprocessing necessary because
  // we don't know whether we stored a true Blob or
  // a base64-encoded string, and if it's a Blob it
  // needs to be read outside of the transaction context
  exports.postProcessAttachments = function (results) {
    return utils.Promise.all(results.map(function (row) {
      if (row.doc && row.doc._attachments) {
        var attNames = Object.keys(row.doc._attachments);
        return utils.Promise.all(attNames.map(function (att) {
          var attObj = row.doc._attachments[att];
          if (!('body' in attObj)) { // already processed
            return;
          }
          var body = attObj.body;
          var type = attObj.content_type;
          return new utils.Promise(function (resolve) {
            exports.readBlobData(body, type, true, function (base64) {
              row.doc._attachments[att] = utils.extend(
                utils.pick(attObj, ['digest', 'content_type']),
                {data: base64}
              );
              resolve();
            });
          });
        }));
      }
    }));
  };
  
  exports.compactRevs = function (revs, docId, txn) {
  
    var possiblyOrphanedDigests = [];
    var seqStore = txn.objectStore(constants.BY_SEQ_STORE);
    var attStore = txn.objectStore(constants.ATTACH_STORE);
    var attAndSeqStore = txn.objectStore(constants.ATTACH_AND_SEQ_STORE);
    var count = revs.length;
  
    function checkDone() {
      count--;
      if (!count) { // done processing all revs
        deleteOrphanedAttachments();
      }
    }
  
    function deleteOrphanedAttachments() {
      if (!possiblyOrphanedDigests.length) {
        return;
      }
      possiblyOrphanedDigests.forEach(function (digest) {
        var countReq = attAndSeqStore.index('digestSeq').count(
          IDBKeyRange.bound(
            digest + '::', digest + '::\uffff', false, false));
        countReq.onsuccess = function (e) {
          var count = e.target.result;
          if (!count) {
            // orphaned
            attStore["delete"](digest);
          }
        };
      });
    }
  
    revs.forEach(function (rev) {
      var index = seqStore.index('_doc_id_rev');
      var key = docId + "::" + rev;
      index.getKey(key).onsuccess = function (e) {
        var seq = e.target.result;
        if (typeof seq !== 'number') {
          return checkDone();
        }
        seqStore["delete"](seq);
  
        var cursor = attAndSeqStore.index('seq')
          .openCursor(IDBKeyRange.only(seq));
  
        cursor.onsuccess = function (event) {
          var cursor = event.target.result;
          if (cursor) {
            var digest = cursor.value.digestSeq.split('::')[0];
            possiblyOrphanedDigests.push(digest);
            attAndSeqStore["delete"](cursor.primaryKey);
            cursor["continue"]();
          } else { // done
            checkDone();
          }
        };
      };
    });
  };
  
  exports.openTransactionSafely = function (idb, stores, mode) {
    try {
      return {
        txn: idb.transaction(stores, mode)
      };
    } catch (err) {
      return {
        error: err
      };
    }
  };
  }).call(this,_dereq_(41))
  },{"19":19,"36":36,"41":41,"6":6}],8:[function(_dereq_,module,exports){
  (function (process){
  'use strict';
  
  var utils = _dereq_(36);
  var merge = _dereq_(31);
  var errors = _dereq_(19);
  var idbUtils = _dereq_(7);
  var idbConstants = _dereq_(6);
  var idbBulkDocs = _dereq_(5);
  var idbAllDocs = _dereq_(3);
  var checkBlobSupport = _dereq_(4);
  
  var ADAPTER_VERSION = idbConstants.ADAPTER_VERSION;
  var ATTACH_AND_SEQ_STORE = idbConstants.ATTACH_AND_SEQ_STORE;
  var ATTACH_STORE = idbConstants.ATTACH_STORE;
  var BY_SEQ_STORE = idbConstants.BY_SEQ_STORE;
  var DETECT_BLOB_SUPPORT_STORE = idbConstants.DETECT_BLOB_SUPPORT_STORE;
  var DOC_STORE = idbConstants.DOC_STORE;
  var LOCAL_STORE = idbConstants.LOCAL_STORE;
  var META_STORE = idbConstants.META_STORE;
  
  var applyNext = idbUtils.applyNext;
  var compactRevs = idbUtils.compactRevs;
  var decodeDoc = idbUtils.decodeDoc;
  var decodeMetadata = idbUtils.decodeMetadata;
  var encodeMetadata = idbUtils.encodeMetadata;
  var fetchAttachmentsIfNecessary = idbUtils.fetchAttachmentsIfNecessary;
  var idbError = idbUtils.idbError;
  var postProcessAttachments = idbUtils.postProcessAttachments;
  var readBlobData = idbUtils.readBlobData;
  var taskQueue = idbUtils.taskQueue;
  var openTransactionSafely = idbUtils.openTransactionSafely;
  
  var cachedDBs = {};
  var blobSupportPromise;
  
  function IdbPouch(opts, callback) {
    var api = this;
  
    taskQueue.queue.push({
      action: function (thisCallback) {
        init(api, opts, thisCallback);
      },
      callback: callback
    });
    applyNext();
  }
  
  function init(api, opts, callback) {
  
    var dbName = opts.name;
  
    var idb = null;
    api._meta = null;
  
    // called when creating a fresh new database
    function createSchema(db) {
      var docStore = db.createObjectStore(DOC_STORE, {keyPath : 'id'});
      db.createObjectStore(BY_SEQ_STORE, {autoIncrement: true})
        .createIndex('_doc_id_rev', '_doc_id_rev', {unique: true});
      db.createObjectStore(ATTACH_STORE, {keyPath: 'digest'});
      db.createObjectStore(META_STORE, {keyPath: 'id', autoIncrement: false});
      db.createObjectStore(DETECT_BLOB_SUPPORT_STORE);
  
      // added in v2
      docStore.createIndex('deletedOrLocal', 'deletedOrLocal', {unique : false});
  
      // added in v3
      db.createObjectStore(LOCAL_STORE, {keyPath: '_id'});
  
      // added in v4
      var attAndSeqStore = db.createObjectStore(ATTACH_AND_SEQ_STORE,
        {autoIncrement: true});
      attAndSeqStore.createIndex('seq', 'seq');
      attAndSeqStore.createIndex('digestSeq', 'digestSeq', {unique: true});
    }
  
    // migration to version 2
    // unfortunately "deletedOrLocal" is a misnomer now that we no longer
    // store local docs in the main doc-store, but whaddyagonnado
    function addDeletedOrLocalIndex(txn, callback) {
      var docStore = txn.objectStore(DOC_STORE);
      docStore.createIndex('deletedOrLocal', 'deletedOrLocal', {unique : false});
  
      docStore.openCursor().onsuccess = function (event) {
        var cursor = event.target.result;
        if (cursor) {
          var metadata = cursor.value;
          var deleted = utils.isDeleted(metadata);
          metadata.deletedOrLocal = deleted ? "1" : "0";
          docStore.put(metadata);
          cursor["continue"]();
        } else {
          callback();
        }
      };
    }
  
    // migration to version 3 (part 1)
    function createLocalStoreSchema(db) {
      db.createObjectStore(LOCAL_STORE, {keyPath: '_id'})
        .createIndex('_doc_id_rev', '_doc_id_rev', {unique: true});
    }
  
    // migration to version 3 (part 2)
    function migrateLocalStore(txn, cb) {
      var localStore = txn.objectStore(LOCAL_STORE);
      var docStore = txn.objectStore(DOC_STORE);
      var seqStore = txn.objectStore(BY_SEQ_STORE);
  
      var cursor = docStore.openCursor();
      cursor.onsuccess = function (event) {
        var cursor = event.target.result;
        if (cursor) {
          var metadata = cursor.value;
          var docId = metadata.id;
          var local = utils.isLocalId(docId);
          var rev = merge.winningRev(metadata);
          if (local) {
            var docIdRev = docId + "::" + rev;
            // remove all seq entries
            // associated with this docId
            var start = docId + "::";
            var end = docId + "::~";
            var index = seqStore.index('_doc_id_rev');
            var range = IDBKeyRange.bound(start, end, false, false);
            var seqCursor = index.openCursor(range);
            seqCursor.onsuccess = function (e) {
              seqCursor = e.target.result;
              if (!seqCursor) {
                // done
                docStore["delete"](cursor.primaryKey);
                cursor["continue"]();
              } else {
                var data = seqCursor.value;
                if (data._doc_id_rev === docIdRev) {
                  localStore.put(data);
                }
                seqStore["delete"](seqCursor.primaryKey);
                seqCursor["continue"]();
              }
            };
          } else {
            cursor["continue"]();
          }
        } else if (cb) {
          cb();
        }
      };
    }
  
    // migration to version 4 (part 1)
    function addAttachAndSeqStore(db) {
      var attAndSeqStore = db.createObjectStore(ATTACH_AND_SEQ_STORE,
        {autoIncrement: true});
      attAndSeqStore.createIndex('seq', 'seq');
      attAndSeqStore.createIndex('digestSeq', 'digestSeq', {unique: true});
    }
  
    // migration to version 4 (part 2)
    function migrateAttsAndSeqs(txn, callback) {
      var seqStore = txn.objectStore(BY_SEQ_STORE);
      var attStore = txn.objectStore(ATTACH_STORE);
      var attAndSeqStore = txn.objectStore(ATTACH_AND_SEQ_STORE);
  
      // need to actually populate the table. this is the expensive part,
      // so as an optimization, check first that this database even
      // contains attachments
      var req = attStore.count();
      req.onsuccess = function (e) {
        var count = e.target.result;
        if (!count) {
          return callback(); // done
        }
  
        seqStore.openCursor().onsuccess = function (e) {
          var cursor = e.target.result;
          if (!cursor) {
            return callback(); // done
          }
          var doc = cursor.value;
          var seq = cursor.primaryKey;
          var atts = Object.keys(doc._attachments || {});
          var digestMap = {};
          for (var j = 0; j < atts.length; j++) {
            var att = doc._attachments[atts[j]];
            digestMap[att.digest] = true; // uniq digests, just in case
          }
          var digests = Object.keys(digestMap);
          for (j = 0; j < digests.length; j++) {
            var digest = digests[j];
            attAndSeqStore.put({
              seq: seq,
              digestSeq: digest + '::' + seq
            });
          }
          cursor["continue"]();
        };
      };
    }
  
    // migration to version 5
    // Instead of relying on on-the-fly migration of metadata,
    // this brings the doc-store to its modern form:
    // - metadata.winningrev
    // - metadata.seq
    // - stringify the metadata when storing it
    function migrateMetadata(txn) {
  
      function decodeMetadataCompat(storedObject) {
        if (!storedObject.data) {
          // old format, when we didn't store it stringified
          storedObject.deleted = storedObject.deletedOrLocal === '1';
          return storedObject;
        }
        return decodeMetadata(storedObject);
      }
  
      // ensure that every metadata has a winningRev and seq,
      // which was previously created on-the-fly but better to migrate
      var bySeqStore = txn.objectStore(BY_SEQ_STORE);
      var docStore = txn.objectStore(DOC_STORE);
      var cursor = docStore.openCursor();
      cursor.onsuccess = function (e) {
        var cursor = e.target.result;
        if (!cursor) {
          return; // done
        }
        var metadata = decodeMetadataCompat(cursor.value);
  
        metadata.winningRev = metadata.winningRev || merge.winningRev(metadata);
  
        function fetchMetadataSeq() {
          // metadata.seq was added post-3.2.0, so if it's missing,
          // we need to fetch it manually
          var start = metadata.id + '::';
          var end = metadata.id + '::\uffff';
          var req = bySeqStore.index('_doc_id_rev').openCursor(
            IDBKeyRange.bound(start, end));
  
          var metadataSeq = 0;
          req.onsuccess = function (e) {
            var cursor = e.target.result;
            if (!cursor) {
              metadata.seq = metadataSeq;
              return onGetMetadataSeq();
            }
            var seq = cursor.primaryKey;
            if (seq > metadataSeq) {
              metadataSeq = seq;
            }
            cursor["continue"]();
          };
        }
  
        function onGetMetadataSeq() {
          var metadataToStore = encodeMetadata(metadata,
            metadata.winningRev, metadata.deleted);
  
          var req = docStore.put(metadataToStore);
          req.onsuccess = function () {
            cursor["continue"]();
          };
        }
  
        if (metadata.seq) {
          return onGetMetadataSeq();
        }
  
        fetchMetadataSeq();
      };
  
    }
  
    api.type = function () {
      return 'idb';
    };
  
    api._id = utils.toPromise(function (callback) {
      callback(null, api._meta.instanceId);
    });
  
    api._bulkDocs = function idb_bulkDocs(req, opts, callback) {
      idbBulkDocs(req, opts, api, idb, IdbPouch.Changes, callback);
    };
  
    // First we look up the metadata in the ids database, then we fetch the
    // current revision(s) from the by sequence store
    api._get = function idb_get(id, opts, callback) {
      var doc;
      var metadata;
      var err;
      var txn;
      opts = utils.clone(opts);
      if (opts.ctx) {
        txn = opts.ctx;
      } else {
        var txnResult = openTransactionSafely(idb,
          [DOC_STORE, BY_SEQ_STORE, ATTACH_STORE], 'readonly');
        if (txnResult.error) {
          return callback(txnResult.error);
        }
        txn = txnResult.txn;
      }
  
      function finish() {
        callback(err, {doc: doc, metadata: metadata, ctx: txn});
      }
  
      txn.objectStore(DOC_STORE).get(id).onsuccess = function (e) {
        metadata = decodeMetadata(e.target.result);
        // we can determine the result here if:
        // 1. there is no such document
        // 2. the document is deleted and we don't ask about specific rev
        // When we ask with opts.rev we expect the answer to be either
        // doc (possibly with _deleted=true) or missing error
        if (!metadata) {
          err = errors.error(errors.MISSING_DOC, 'missing');
          return finish();
        }
        if (utils.isDeleted(metadata) && !opts.rev) {
          err = errors.error(errors.MISSING_DOC, "deleted");
          return finish();
        }
        var objectStore = txn.objectStore(BY_SEQ_STORE);
  
        var rev = opts.rev || metadata.winningRev;
        var key = metadata.id + '::' + rev;
  
        objectStore.index('_doc_id_rev').get(key).onsuccess = function (e) {
          doc = e.target.result;
          if (doc) {
            doc = decodeDoc(doc);
          }
          if (!doc) {
            err = errors.error(errors.MISSING_DOC, 'missing');
            return finish();
          }
          finish();
        };
      };
    };
  
    api._getAttachment = function (attachment, opts, callback) {
      var txn;
      opts = utils.clone(opts);
      if (opts.ctx) {
        txn = opts.ctx;
      } else {
        var txnResult = openTransactionSafely(idb,
          [DOC_STORE, BY_SEQ_STORE, ATTACH_STORE], 'readonly');
        if (txnResult.error) {
          return callback(txnResult.error);
        }
        txn = txnResult.txn;
      }
      var digest = attachment.digest;
      var type = attachment.content_type;
  
      txn.objectStore(ATTACH_STORE).get(digest).onsuccess = function (e) {
        var body = e.target.result.body;
        readBlobData(body, type, opts.encode, function (blobData) {
          callback(null, blobData);
        });
      };
    };
  
    api._info = function idb_info(callback) {
  
      if (idb === null || !cachedDBs[dbName]) {
        var error = new Error('db isn\'t open');
        error.id = 'idbNull';
        return callback(error);
      }
      var updateSeq;
      var docCount;
  
      var txnResult = openTransactionSafely(idb, [BY_SEQ_STORE], 'readonly');
      if (txnResult.error) {
        return callback(txnResult.error);
      }
      var txn = txnResult.txn;
      var cursor = txn.objectStore(BY_SEQ_STORE).openCursor(null, 'prev');
      cursor.onsuccess = function (event) {
        var cursor = event.target.result;
        updateSeq = cursor ? cursor.key : 0;
        // count within the same txn for consistency
        docCount = api._meta.docCount;
      };
  
      txn.oncomplete = function () {
        callback(null, {
          doc_count: docCount,
          update_seq: updateSeq,
          // for debugging
          idb_attachment_format: (api._meta.blobSupport ? 'binary' : 'base64')
        });
      };
    };
  
    api._allDocs = function idb_allDocs(opts, callback) {
      idbAllDocs(opts, api, idb, callback);
    };
  
    api._changes = function (opts) {
      opts = utils.clone(opts);
  
      if (opts.continuous) {
        var id = dbName + ':' + utils.uuid();
        IdbPouch.Changes.addListener(dbName, id, api, opts);
        IdbPouch.Changes.notify(dbName);
        return {
          cancel: function () {
            IdbPouch.Changes.removeListener(dbName, id);
          }
        };
      }
  
      var docIds = opts.doc_ids && new utils.Set(opts.doc_ids);
      var descending = opts.descending ? 'prev' : null;
  
      opts.since = opts.since || 0;
      var lastSeq = opts.since;
  
      var limit = 'limit' in opts ? opts.limit : -1;
      if (limit === 0) {
        limit = 1; // per CouchDB _changes spec
      }
      var returnDocs;
      if ('returnDocs' in opts) {
        returnDocs = opts.returnDocs;
      } else {
        returnDocs = true;
      }
  
      var results = [];
      var numResults = 0;
      var filter = utils.filterChange(opts);
      var docIdsToMetadata = new utils.Map();
  
      var txn;
      var bySeqStore;
      var docStore;
  
      function onGetCursor(cursor) {
  
        var doc = decodeDoc(cursor.value);
        var seq = cursor.key;
  
        if (docIds && !docIds.has(doc._id)) {
          return cursor["continue"]();
        }
  
        var metadata;
  
        function onGetMetadata() {
          if (metadata.seq !== seq) {
            // some other seq is later
            return cursor["continue"]();
          }
  
          lastSeq = seq;
  
          if (metadata.winningRev === doc._rev) {
            return onGetWinningDoc(doc);
          }
  
          fetchWinningDoc();
        }
  
        function fetchWinningDoc() {
          var docIdRev = doc._id + '::' + metadata.winningRev;
          var req = bySeqStore.index('_doc_id_rev').openCursor(
            IDBKeyRange.bound(docIdRev, docIdRev + '\uffff'));
          req.onsuccess = function (e) {
            onGetWinningDoc(decodeDoc(e.target.result.value));
          };
        }
  
        function onGetWinningDoc(winningDoc) {
  
          var change = opts.processChange(winningDoc, metadata, opts);
          change.seq = metadata.seq;
          if (filter(change)) {
            numResults++;
            if (returnDocs) {
              results.push(change);
            }
            // process the attachment immediately
            // for the benefit of live listeners
            if (opts.attachments && opts.include_docs) {
              fetchAttachmentsIfNecessary(winningDoc, opts, txn, function () {
                postProcessAttachments([change]).then(function () {
                  opts.onChange(change);
                });
              });
            } else {
              opts.onChange(change);
            }
          }
          if (numResults !== limit) {
            cursor["continue"]();
          }
        }
  
        metadata = docIdsToMetadata.get(doc._id);
        if (metadata) { // cached
          return onGetMetadata();
        }
        // metadata not cached, have to go fetch it
        docStore.get(doc._id).onsuccess = function (event) {
          metadata = decodeMetadata(event.target.result);
          docIdsToMetadata.set(doc._id, metadata);
          onGetMetadata();
        };
      }
  
      function onsuccess(event) {
        var cursor = event.target.result;
  
        if (!cursor) {
          return;
        }
        onGetCursor(cursor);
      }
  
      function fetchChanges() {
        var objectStores = [DOC_STORE, BY_SEQ_STORE];
        if (opts.attachments) {
          objectStores.push(ATTACH_STORE);
        }
        var txnResult = openTransactionSafely(idb, objectStores, 'readonly');
        if (txnResult.error) {
          return opts.complete(txnResult.error);
        }
        txn = txnResult.txn;
        txn.onerror = idbError(opts.complete);
        txn.oncomplete = onTxnComplete;
  
        bySeqStore = txn.objectStore(BY_SEQ_STORE);
        docStore = txn.objectStore(DOC_STORE);
  
        var req;
  
        if (descending) {
          req = bySeqStore.openCursor(
  
            null, descending);
        } else {
          req = bySeqStore.openCursor(
            IDBKeyRange.lowerBound(opts.since, true));
        }
  
        req.onsuccess = onsuccess;
      }
  
      fetchChanges();
  
      function onTxnComplete() {
  
        function finish() {
          opts.complete(null, {
            results: results,
            last_seq: lastSeq
          });
        }
  
        if (!opts.continuous && opts.attachments) {
          // cannot guarantee that postProcessing was already done,
          // so do it again
          postProcessAttachments(results).then(finish);
        } else {
          finish();
        }
      }
    };
  
    api._close = function (callback) {
      if (idb === null) {
        return callback(errors.error(errors.NOT_OPEN));
      }
  
      // https://developer.mozilla.org/en-US/docs/IndexedDB/IDBDatabase#close
      // "Returns immediately and closes the connection in a separate thread..."
      idb.close();
      delete cachedDBs[dbName];
      idb = null;
      callback();
    };
  
    api._getRevisionTree = function (docId, callback) {
      var txnResult = openTransactionSafely(idb, [DOC_STORE], 'readonly');
      if (txnResult.error) {
        return callback(txnResult.error);
      }
      var txn = txnResult.txn;
      var req = txn.objectStore(DOC_STORE).get(docId);
      req.onsuccess = function (event) {
        var doc = decodeMetadata(event.target.result);
        if (!doc) {
          callback(errors.error(errors.MISSING_DOC));
        } else {
          callback(null, doc.rev_tree);
        }
      };
    };
  
    // This function removes revisions of document docId
    // which are listed in revs and sets this document
    // revision to to rev_tree
    api._doCompaction = function (docId, revs, callback) {
      var stores = [
        DOC_STORE,
        BY_SEQ_STORE,
        ATTACH_STORE,
        ATTACH_AND_SEQ_STORE
      ];
      var txnResult = openTransactionSafely(idb, stores, 'readwrite');
      if (txnResult.error) {
        return callback(txnResult.error);
      }
      var txn = txnResult.txn;
  
      var docStore = txn.objectStore(DOC_STORE);
  
      docStore.get(docId).onsuccess = function (event) {
        var metadata = decodeMetadata(event.target.result);
        merge.traverseRevTree(metadata.rev_tree, function (isLeaf, pos,
                                                           revHash, ctx, opts) {
          var rev = pos + '-' + revHash;
          if (revs.indexOf(rev) !== -1) {
            opts.status = 'missing';
          }
        });
        compactRevs(revs, docId, txn);
        var winningRev = metadata.winningRev;
        var deleted = metadata.deleted;
        txn.objectStore(DOC_STORE).put(
          encodeMetadata(metadata, winningRev, deleted));
      };
      txn.onerror = idbError(callback);
      txn.oncomplete = function () {
        utils.call(callback);
      };
    };
  
  
    api._getLocal = function (id, callback) {
      var txnResult = openTransactionSafely(idb, [LOCAL_STORE], 'readonly');
      if (txnResult.error) {
        return callback(txnResult.error);
      }
      var tx = txnResult.txn;
      var req = tx.objectStore(LOCAL_STORE).get(id);
  
      req.onerror = idbError(callback);
      req.onsuccess = function (e) {
        var doc = e.target.result;
        if (!doc) {
          callback(errors.error(errors.MISSING_DOC));
        } else {
          delete doc['_doc_id_rev']; // for backwards compat
          callback(null, doc);
        }
      };
    };
  
    api._putLocal = function (doc, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      delete doc._revisions; // ignore this, trust the rev
      var oldRev = doc._rev;
      var id = doc._id;
      if (!oldRev) {
        doc._rev = '0-1';
      } else {
        doc._rev = '0-' + (parseInt(oldRev.split('-')[1], 10) + 1);
      }
  
      var tx = opts.ctx;
      var ret;
      if (!tx) {
        var txnResult = openTransactionSafely(idb, [LOCAL_STORE], 'readwrite');
        if (txnResult.error) {
          return callback(txnResult.error);
        }
        tx = txnResult.txn;
        tx.onerror = idbError(callback);
        tx.oncomplete = function () {
          if (ret) {
            callback(null, ret);
          }
        };
      }
  
      var oStore = tx.objectStore(LOCAL_STORE);
      var req;
      if (oldRev) {
        req = oStore.get(id);
        req.onsuccess = function (e) {
          var oldDoc = e.target.result;
          if (!oldDoc || oldDoc._rev !== oldRev) {
            callback(errors.error(errors.REV_CONFLICT));
          } else { // update
            var req = oStore.put(doc);
            req.onsuccess = function () {
              ret = {ok: true, id: doc._id, rev: doc._rev};
              if (opts.ctx) { // return immediately
                callback(null, ret);
              }
            };
          }
        };
      } else { // new doc
        req = oStore.add(doc);
        req.onerror = function (e) {
          // constraint error, already exists
          callback(errors.error(errors.REV_CONFLICT));
          e.preventDefault(); // avoid transaction abort
          e.stopPropagation(); // avoid transaction onerror
        };
        req.onsuccess = function () {
          ret = {ok: true, id: doc._id, rev: doc._rev};
          if (opts.ctx) { // return immediately
            callback(null, ret);
          }
        };
      }
    };
  
    api._removeLocal = function (doc, callback) {
      var txnResult = openTransactionSafely(idb, [LOCAL_STORE], 'readwrite');
      if (txnResult.error) {
        return callback(txnResult.error);
      }
      var tx = txnResult.txn;
      var ret;
      tx.oncomplete = function () {
        if (ret) {
          callback(null, ret);
        }
      };
      var id = doc._id;
      var oStore = tx.objectStore(LOCAL_STORE);
      var req = oStore.get(id);
  
      req.onerror = idbError(callback);
      req.onsuccess = function (e) {
        var oldDoc = e.target.result;
        if (!oldDoc || oldDoc._rev !== doc._rev) {
          callback(errors.error(errors.MISSING_DOC));
        } else {
          oStore["delete"](id);
          ret = {ok: true, id: id, rev: '0-0'};
        }
      };
    };
  
    api._destroy = function (callback) {
      IdbPouch.Changes.removeAllListeners(dbName);
  
      //Close open request for "dbName" database to fix ie delay.
      if (IdbPouch.openReqList[dbName] && IdbPouch.openReqList[dbName].result) {
        IdbPouch.openReqList[dbName].result.close();
        delete cachedDBs[dbName];
      }
      var req = indexedDB.deleteDatabase(dbName);
  
      req.onsuccess = function () {
        //Remove open request from the list.
        if (IdbPouch.openReqList[dbName]) {
          IdbPouch.openReqList[dbName] = null;
        }
        if (utils.hasLocalStorage() && (dbName in localStorage)) {
          delete localStorage[dbName];
        }
        callback(null, { 'ok': true });
      };
  
      req.onerror = idbError(callback);
    };
  
    var cached = cachedDBs[dbName];
  
    if (cached) {
      idb = cached.idb;
      api._meta = cached.global;
      process.nextTick(function () {
        callback(null, api);
      });
      return;
    }
  
    var req = indexedDB.open(dbName, ADAPTER_VERSION);
  
    if (!('openReqList' in IdbPouch)) {
      IdbPouch.openReqList = {};
    }
    IdbPouch.openReqList[dbName] = req;
  
    req.onupgradeneeded = function (e) {
      var db = e.target.result;
      if (e.oldVersion < 1) {
        return createSchema(db); // new db, initial schema
      }
      // do migrations
  
      var txn = e.currentTarget.transaction;
      // these migrations have to be done in this function, before
      // control is returned to the event loop, because IndexedDB
  
      if (e.oldVersion < 3) {
        createLocalStoreSchema(db); // v2 -> v3
      }
      if (e.oldVersion < 4) {
        addAttachAndSeqStore(db); // v3 -> v4
      }
  
      var migrations = [
        addDeletedOrLocalIndex, // v1 -> v2
        migrateLocalStore,      // v2 -> v3
        migrateAttsAndSeqs,     // v3 -> v4
        migrateMetadata         // v4 -> v5
      ];
  
      var i = e.oldVersion;
  
      function next() {
        var migration = migrations[i - 1];
        i++;
        if (migration) {
          migration(txn, next);
        }
      }
  
      next();
    };
  
    req.onsuccess = function (e) {
  
      idb = e.target.result;
  
      idb.onversionchange = function () {
        idb.close();
        delete cachedDBs[dbName];
      };
      idb.onabort = function () {
        idb.close();
        delete cachedDBs[dbName];
      };
  
      var txn = idb.transaction([
          META_STORE,
          DETECT_BLOB_SUPPORT_STORE,
          DOC_STORE
        ], 'readwrite');
  
      var req = txn.objectStore(META_STORE).get(META_STORE);
  
      var blobSupport = null;
      var docCount = null;
      var instanceId = null;
  
      req.onsuccess = function (e) {
  
        var checkSetupComplete = function () {
          if (blobSupport === null || docCount === null ||
              instanceId === null) {
            return;
          } else {
            api._meta = {
              name: dbName,
              instanceId: instanceId,
              blobSupport: blobSupport,
              docCount: docCount
            };
  
            cachedDBs[dbName] = {
              idb: idb,
              global: api._meta
            };
            callback(null, api);
          }
        };
  
        //
        // fetch/store the id
        //
  
        var meta = e.target.result || {id: META_STORE};
        if (dbName  + '_id' in meta) {
          instanceId = meta[dbName + '_id'];
          checkSetupComplete();
        } else {
          instanceId = utils.uuid();
          meta[dbName + '_id'] = instanceId;
          txn.objectStore(META_STORE).put(meta).onsuccess = function () {
            checkSetupComplete();
          };
        }
  
        //
        // check blob support
        //
  
        if (!blobSupportPromise) {
          // make sure blob support is only checked once
          blobSupportPromise = checkBlobSupport(txn, idb);
        }
  
        blobSupportPromise.then(function (val) {
          blobSupport = val;
          checkSetupComplete();
        });
  
        //
        // count docs
        //
  
        var index = txn.objectStore(DOC_STORE).index('deletedOrLocal');
        index.count(IDBKeyRange.only('0')).onsuccess = function (e) {
          docCount = e.target.result;
          checkSetupComplete();
        };
  
      };
    };
  
    req.onerror = idbError(callback);
  
  }
  
  IdbPouch.valid = function () {
    // Issue #2533, we finally gave up on doing bug
    // detection instead of browser sniffing. Safari brought us
    // to our knees.
    var isSafari = typeof openDatabase !== 'undefined' &&
      /(Safari|iPhone|iPad|iPod)/.test(navigator.userAgent) &&
      !/Chrome/.test(navigator.userAgent) &&
      !/BlackBerry/.test(navigator.platform);
  
    // some outdated implementations of IDB that appear on Samsung
    // and HTC Android devices <4.4 are missing IDBKeyRange
    return !isSafari && typeof indexedDB !== 'undefined' &&
      typeof IDBKeyRange !== 'undefined';
  };
  
  IdbPouch.Changes = new utils.Changes();
  
  module.exports = IdbPouch;
  
  }).call(this,_dereq_(41))
  },{"19":19,"3":3,"31":31,"36":36,"4":4,"41":41,"5":5,"6":6,"7":7}],9:[function(_dereq_,module,exports){
  'use strict';
  
  var utils = _dereq_(36);
  var errors = _dereq_(19);
  
  var websqlUtils = _dereq_(11);
  var websqlConstants = _dereq_(10);
  
  var DOC_STORE = websqlConstants.DOC_STORE;
  var BY_SEQ_STORE = websqlConstants.BY_SEQ_STORE;
  var ATTACH_STORE = websqlConstants.ATTACH_STORE;
  var ATTACH_AND_SEQ_STORE = websqlConstants.ATTACH_AND_SEQ_STORE;
  
  var select = websqlUtils.select;
  var stringifyDoc = websqlUtils.stringifyDoc;
  var compactRevs = websqlUtils.compactRevs;
  var unknownError = websqlUtils.unknownError;
  
  function websqlBulkDocs(req, opts, api, db, Changes, callback) {
    var newEdits = opts.new_edits;
    var userDocs = req.docs;
  
    // Parse the docs, give them a sequence number for the result
    var docInfos = userDocs.map(function (doc) {
      if (doc._id && utils.isLocalId(doc._id)) {
        return doc;
      }
      var newDoc = utils.parseDoc(doc, newEdits);
      return newDoc;
    });
  
    var docInfoErrors = docInfos.filter(function (docInfo) {
      return docInfo.error;
    });
    if (docInfoErrors.length) {
      return callback(docInfoErrors[0]);
    }
  
    var tx;
    var results = new Array(docInfos.length);
    var fetchedDocs = new utils.Map();
  
    var preconditionErrored;
    function complete() {
      if (preconditionErrored) {
        return callback(preconditionErrored);
      }
      Changes.notify(api._name);
      api._docCount = -1; // invalidate
      callback(null, results);
    }
  
    function verifyAttachment(digest, callback) {
      var sql = 'SELECT count(*) as cnt FROM ' + ATTACH_STORE +
        ' WHERE digest=?';
      tx.executeSql(sql, [digest], function (tx, result) {
        if (result.rows.item(0).cnt === 0) {
          var err = errors.error(errors.MISSING_STUB,
            'unknown stub attachment with digest ' +
            digest);
          callback(err);
        } else {
          callback();
        }
      });
    }
  
    function verifyAttachments(finish) {
      var digests = [];
      docInfos.forEach(function (docInfo) {
        if (docInfo.data && docInfo.data._attachments) {
          Object.keys(docInfo.data._attachments).forEach(function (filename) {
            var att = docInfo.data._attachments[filename];
            if (att.stub) {
              digests.push(att.digest);
            }
          });
        }
      });
      if (!digests.length) {
        return finish();
      }
      var numDone = 0;
      var err;
  
      function checkDone() {
        if (++numDone === digests.length) {
          finish(err);
        }
      }
      digests.forEach(function (digest) {
        verifyAttachment(digest, function (attErr) {
          if (attErr && !err) {
            err = attErr;
          }
          checkDone();
        });
      });
    }
  
    function writeDoc(docInfo, winningRev, winningRevIsDeleted, newRevIsDeleted,
                      isUpdate, delta, resultsIdx, callback) {
  
      function finish() {
        var data = docInfo.data;
        var deletedInt = newRevIsDeleted ? 1 : 0;
  
        var id = data._id;
        var rev = data._rev;
        var json = stringifyDoc(data);
        var sql = 'INSERT INTO ' + BY_SEQ_STORE +
          ' (doc_id, rev, json, deleted) VALUES (?, ?, ?, ?);';
        var sqlArgs = [id, rev, json, deletedInt];
  
        // map seqs to attachment digests, which
        // we will need later during compaction
        function insertAttachmentMappings(seq, callback) {
          var attsAdded = 0;
          var attsToAdd = Object.keys(data._attachments || {});
  
          if (!attsToAdd.length) {
            return callback();
          }
          function checkDone() {
            if (++attsAdded === attsToAdd.length) {
              callback();
            }
            return false; // ack handling a constraint error
          }
          function add(att) {
            var sql = 'INSERT INTO ' + ATTACH_AND_SEQ_STORE +
              ' (digest, seq) VALUES (?,?)';
            var sqlArgs = [data._attachments[att].digest, seq];
            tx.executeSql(sql, sqlArgs, checkDone, checkDone);
            // second callback is for a constaint error, which we ignore
            // because this docid/rev has already been associated with
            // the digest (e.g. when new_edits == false)
          }
          for (var i = 0; i < attsToAdd.length; i++) {
            add(attsToAdd[i]); // do in parallel
          }
        }
  
        tx.executeSql(sql, sqlArgs, function (tx, result) {
          var seq = result.insertId;
          insertAttachmentMappings(seq, function () {
            dataWritten(tx, seq);
          });
        }, function () {
          // constraint error, recover by updating instead (see #1638)
          var fetchSql = select('seq', BY_SEQ_STORE, null,
            'doc_id=? AND rev=?');
          tx.executeSql(fetchSql, [id, rev], function (tx, res) {
            var seq = res.rows.item(0).seq;
            var sql = 'UPDATE ' + BY_SEQ_STORE +
              ' SET json=?, deleted=? WHERE doc_id=? AND rev=?;';
            var sqlArgs = [json, deletedInt, id, rev];
            tx.executeSql(sql, sqlArgs, function (tx) {
              insertAttachmentMappings(seq, function () {
                dataWritten(tx, seq);
              });
            });
          });
          return false; // ack that we've handled the error
        });
      }
  
      function collectResults(attachmentErr) {
        if (!err) {
          if (attachmentErr) {
            err = attachmentErr;
            callback(err);
          } else if (recv === attachments.length) {
            finish();
          }
        }
      }
  
      var err = null;
      var recv = 0;
  
      docInfo.data._id = docInfo.metadata.id;
      docInfo.data._rev = docInfo.metadata.rev;
      var attachments = Object.keys(docInfo.data._attachments || {});
  
  
      if (newRevIsDeleted) {
        docInfo.data._deleted = true;
      }
  
      function attachmentSaved(err) {
        recv++;
        collectResults(err);
      }
  
      attachments.forEach(function (key) {
        var att = docInfo.data._attachments[key];
        if (!att.stub) {
          var data = att.data;
          delete att.data;
          var digest = att.digest;
          saveAttachment(digest, data, attachmentSaved);
        } else {
          recv++;
          collectResults();
        }
      });
  
      if (!attachments.length) {
        finish();
      }
  
      function autoCompact() {
        if (!isUpdate || !api.auto_compaction) {
          return; // nothing to do
        }
        var id = docInfo.metadata.id;
        var revsToDelete = utils.compactTree(docInfo.metadata);
        compactRevs(revsToDelete, id, tx);
      }
  
      function dataWritten(tx, seq) {
        autoCompact();
        docInfo.metadata.seq = seq;
        delete docInfo.metadata.rev;
  
        var sql = isUpdate ?
        'UPDATE ' + DOC_STORE +
        ' SET json=?, max_seq=?, winningseq=' +
        '(SELECT seq FROM ' + BY_SEQ_STORE +
        ' WHERE doc_id=' + DOC_STORE + '.id AND rev=?) WHERE id=?'
          : 'INSERT INTO ' + DOC_STORE +
        ' (id, winningseq, max_seq, json) VALUES (?,?,?,?);';
        var metadataStr = utils.safeJsonStringify(docInfo.metadata);
        var id = docInfo.metadata.id;
        var params = isUpdate ?
          [metadataStr, seq, winningRev, id] :
          [id, seq, seq, metadataStr];
        tx.executeSql(sql, params, function () {
          results[resultsIdx] = {
            ok: true,
            id: docInfo.metadata.id,
            rev: winningRev
          };
          fetchedDocs.set(id, docInfo.metadata);
          callback();
        });
      }
    }
  
    function processDocs() {
      utils.processDocs(docInfos, api, fetchedDocs,
        tx, results, writeDoc, opts);
    }
  
    function fetchExistingDocs(callback) {
      if (!docInfos.length) {
        return callback();
      }
  
      var numFetched = 0;
  
      function checkDone() {
        if (++numFetched === docInfos.length) {
          callback();
        }
      }
  
      docInfos.forEach(function (docInfo) {
        if (docInfo._id && utils.isLocalId(docInfo._id)) {
          return checkDone(); // skip local docs
        }
        var id = docInfo.metadata.id;
        tx.executeSql('SELECT json FROM ' + DOC_STORE +
        ' WHERE id = ?', [id], function (tx, result) {
          if (result.rows.length) {
            var metadata = utils.safeJsonParse(result.rows.item(0).json);
            fetchedDocs.set(id, metadata);
          }
          checkDone();
        });
      });
    }
  
    function saveAttachment(digest, data, callback) {
      var sql = 'SELECT digest FROM ' + ATTACH_STORE + ' WHERE digest=?';
      tx.executeSql(sql, [digest], function (tx, result) {
        if (result.rows.length) { // attachment already exists
          return callback();
        }
        // we could just insert before selecting and catch the error,
        // but my hunch is that it's cheaper not to serialize the blob
        // from JS to C if we don't have to (TODO: confirm this)
        sql = 'INSERT INTO ' + ATTACH_STORE +
        ' (digest, body, escaped) VALUES (?,?,1)';
        tx.executeSql(sql, [digest, websqlUtils.escapeBlob(data)], function () {
          callback();
        }, function () {
          // ignore constaint errors, means it already exists
          callback();
          return false; // ack we handled the error
        });
      });
    }
  
    utils.preprocessAttachments(docInfos, 'binary', function (err) {
      if (err) {
        return callback(err);
      }
      db.transaction(function (txn) {
        tx = txn;
        verifyAttachments(function (err) {
          if (err) {
            preconditionErrored = err;
          } else {
            fetchExistingDocs(processDocs);
          }
        });
      }, unknownError(callback), complete);
    });
  }
  
  module.exports = websqlBulkDocs;
  
  },{"10":10,"11":11,"19":19,"36":36}],10:[function(_dereq_,module,exports){
  'use strict';
  
  function quote(str) {
    return "'" + str + "'";
  }
  
  exports.ADAPTER_VERSION = 7; // used to manage migrations
  
  // The object stores created for each database
  // DOC_STORE stores the document meta data, its revision history and state
  exports.DOC_STORE = quote('document-store');
  // BY_SEQ_STORE stores a particular version of a document, keyed by its
  // sequence id
  exports.BY_SEQ_STORE = quote('by-sequence');
  // Where we store attachments
  exports.ATTACH_STORE = quote('attach-store');
  exports.LOCAL_STORE = quote('local-store');
  exports.META_STORE = quote('metadata-store');
  // where we store many-to-many relations between attachment
  // digests and seqs
  exports.ATTACH_AND_SEQ_STORE = quote('attach-seq-store');
  
  
  },{}],11:[function(_dereq_,module,exports){
  'use strict';
  
  var utils = _dereq_(36);
  var errors = _dereq_(19);
  
  var websqlConstants = _dereq_(10);
  
  var BY_SEQ_STORE = websqlConstants.BY_SEQ_STORE;
  var ATTACH_STORE = websqlConstants.ATTACH_STORE;
  var ATTACH_AND_SEQ_STORE = websqlConstants.ATTACH_AND_SEQ_STORE;
  
  // escapeBlob and unescapeBlob are workarounds for a websql bug:
  // https://code.google.com/p/chromium/issues/detail?id=422690
  // https://bugs.webkit.org/show_bug.cgi?id=137637
  // The goal is to never actually insert the \u0000 character
  // in the database.
  function escapeBlob(str) {
    return str
      .replace(/\u0002/g, '\u0002\u0002')
      .replace(/\u0001/g, '\u0001\u0002')
      .replace(/\u0000/g, '\u0001\u0001');
  }
  
  function unescapeBlob(str) {
    return str
      .replace(/\u0001\u0001/g, '\u0000')
      .replace(/\u0001\u0002/g, '\u0001')
      .replace(/\u0002\u0002/g, '\u0002');
  }
  
  function stringifyDoc(doc) {
    // don't bother storing the id/rev. it uses lots of space,
    // in persistent map/reduce especially
    delete doc._id;
    delete doc._rev;
    return JSON.stringify(doc);
  }
  
  function unstringifyDoc(doc, id, rev) {
    doc = JSON.parse(doc);
    doc._id = id;
    doc._rev = rev;
    return doc;
  }
  
  // question mark groups IN queries, e.g. 3 -> '(?,?,?)'
  function qMarks(num) {
    var s = '(';
    while (num--) {
      s += '?';
      if (num) {
        s += ',';
      }
    }
    return s + ')';
  }
  
  function select(selector, table, joiner, where, orderBy) {
    return 'SELECT ' + selector + ' FROM ' +
      (typeof table === 'string' ? table : table.join(' JOIN ')) +
      (joiner ? (' ON ' + joiner) : '') +
      (where ? (' WHERE ' +
      (typeof where === 'string' ? where : where.join(' AND '))) : '') +
      (orderBy ? (' ORDER BY ' + orderBy) : '');
  }
  
  function compactRevs(revs, docId, tx) {
  
    if (!revs.length) {
      return;
    }
  
    var numDone = 0;
    var seqs = [];
  
    function checkDone() {
      if (++numDone === revs.length) { // done
        deleteOrphans();
      }
    }
  
    function deleteOrphans() {
      // find orphaned attachment digests
  
      if (!seqs.length) {
        return;
      }
  
      var sql = 'SELECT DISTINCT digest AS digest FROM ' +
        ATTACH_AND_SEQ_STORE + ' WHERE seq IN ' + qMarks(seqs.length);
  
      tx.executeSql(sql, seqs, function (tx, res) {
  
        var digestsToCheck = [];
        for (var i = 0; i < res.rows.length; i++) {
          digestsToCheck.push(res.rows.item(i).digest);
        }
        if (!digestsToCheck.length) {
          return;
        }
  
        var sql = 'DELETE FROM ' + ATTACH_AND_SEQ_STORE +
          ' WHERE seq IN (' +
          seqs.map(function () { return '?'; }).join(',') +
          ')';
        tx.executeSql(sql, seqs, function (tx) {
  
          var sql = 'SELECT digest FROM ' + ATTACH_AND_SEQ_STORE +
            ' WHERE digest IN (' +
            digestsToCheck.map(function () { return '?'; }).join(',') +
            ')';
          tx.executeSql(sql, digestsToCheck, function (tx, res) {
            var nonOrphanedDigests = new utils.Set();
            for (var i = 0; i < res.rows.length; i++) {
              nonOrphanedDigests.add(res.rows.item(i).digest);
            }
            digestsToCheck.forEach(function (digest) {
              if (nonOrphanedDigests.has(digest)) {
                return;
              }
              tx.executeSql(
                'DELETE FROM ' + ATTACH_AND_SEQ_STORE + ' WHERE digest=?',
                [digest]);
              tx.executeSql(
                'DELETE FROM ' + ATTACH_STORE + ' WHERE digest=?', [digest]);
            });
          });
        });
      });
    }
  
    // update by-seq and attach stores in parallel
    revs.forEach(function (rev) {
      var sql = 'SELECT seq FROM ' + BY_SEQ_STORE +
        ' WHERE doc_id=? AND rev=?';
  
      tx.executeSql(sql, [docId, rev], function (tx, res) {
        if (!res.rows.length) { // already deleted
          return checkDone();
        }
        var seq = res.rows.item(0).seq;
        seqs.push(seq);
  
        tx.executeSql(
          'DELETE FROM ' + BY_SEQ_STORE + ' WHERE seq=?', [seq], checkDone);
      });
    });
  }
  
  function unknownError(callback) {
    return function (event) {
      // event may actually be a SQLError object, so report is as such
      var errorNameMatch = event && event.constructor.toString()
          .match(/function ([^\(]+)/);
      var errorName = (errorNameMatch && errorNameMatch[1]) || event.type;
      var errorReason = event.target || event.message;
      callback(errors.error(errors.WSQ_ERROR, errorReason, errorName));
    };
  }
  
  function getSize(opts) {
    if ('size' in opts) {
      // triggers immediate popup in iOS, fixes #2347
      // e.g. 5000001 asks for 5 MB, 10000001 asks for 10 MB,
      return opts.size * 1000000;
    }
    // In iOS, doesn't matter as long as it's <= 5000000.
    // Except that if you request too much, our tests fail
    // because of the native "do you accept?" popup.
    // In Android <=4.3, this value is actually used as an
    // honest-to-god ceiling for data, so we need to
    // set it to a decently high number.
    var isAndroid = /Android/.test(window.navigator.userAgent);
    return isAndroid ? 5000000 : 1; // in PhantomJS, if you use 0 it will crash
  }
  
  function createOpenDBFunction() {
    if (typeof sqlitePlugin !== 'undefined') {
      // The SQLite Plugin started deviating pretty heavily from the
      // standard openDatabase() function, as they started adding more features.
      // It's better to just use their "new" format and pass in a big ol'
      // options object.
      return sqlitePlugin.openDatabase.bind(sqlitePlugin);
    }
  
    if (typeof openDatabase !== 'undefined') {
      return function openDB(opts) {
        // Traditional WebSQL API
        return openDatabase(opts.name, opts.version, opts.description, opts.size);
      };
    }
  }
  
  var cachedDatabases = {};
  
  function openDB(opts) {
  
    var openDBFunction = createOpenDBFunction();
  
    var db = cachedDatabases[opts.name];
    if (!db) {
      db = cachedDatabases[opts.name] = openDBFunction(opts);
      db._sqlitePlugin = typeof sqlitePlugin !== 'undefined';
    }
    return db;
  }
  
  function valid() {
    // SQLitePlugin leaks this global object, which we can use
    // to detect if it's installed or not. The benefit is that it's
    // declared immediately, before the 'deviceready' event has fired.
    return typeof openDatabase !== 'undefined' ||
      typeof SQLitePlugin !== 'undefined';
  }
  
  module.exports = {
    escapeBlob: escapeBlob,
    unescapeBlob: unescapeBlob,
    stringifyDoc: stringifyDoc,
    unstringifyDoc: unstringifyDoc,
    qMarks: qMarks,
    select: select,
    compactRevs: compactRevs,
    unknownError: unknownError,
    getSize: getSize,
    openDB: openDB,
    valid: valid
  };
  },{"10":10,"19":19,"36":36}],12:[function(_dereq_,module,exports){
  'use strict';
  
  var utils = _dereq_(36);
  var merge = _dereq_(31);
  var errors = _dereq_(19);
  var parseHexString = _dereq_(23);
  
  var websqlConstants = _dereq_(10);
  var websqlUtils = _dereq_(11);
  var websqlBulkDocs = _dereq_(9);
  
  var ADAPTER_VERSION = websqlConstants.ADAPTER_VERSION;
  var DOC_STORE = websqlConstants.DOC_STORE;
  var BY_SEQ_STORE = websqlConstants.BY_SEQ_STORE;
  var ATTACH_STORE = websqlConstants.ATTACH_STORE;
  var LOCAL_STORE = websqlConstants.LOCAL_STORE;
  var META_STORE = websqlConstants.META_STORE;
  var ATTACH_AND_SEQ_STORE = websqlConstants.ATTACH_AND_SEQ_STORE;
  
  var qMarks = websqlUtils.qMarks;
  var stringifyDoc = websqlUtils.stringifyDoc;
  var unstringifyDoc = websqlUtils.unstringifyDoc;
  var select = websqlUtils.select;
  var compactRevs = websqlUtils.compactRevs;
  var unknownError = websqlUtils.unknownError;
  var getSize = websqlUtils.getSize;
  var openDB = websqlUtils.openDB;
  
  function fetchAttachmentsIfNecessary(doc, opts, api, txn, cb) {
    var attachments = Object.keys(doc._attachments || {});
    if (!attachments.length) {
      return cb && cb();
    }
    var numDone = 0;
  
    function checkDone() {
      if (++numDone === attachments.length && cb) {
        cb();
      }
    }
  
    function fetchAttachment(doc, att) {
      var attObj = doc._attachments[att];
      var attOpts = {encode: true, ctx: txn};
      api._getAttachment(attObj, attOpts, function (_, base64) {
        doc._attachments[att] = utils.extend(
          utils.pick(attObj, ['digest', 'content_type']),
          { data: base64 }
        );
        checkDone();
      });
    }
  
    attachments.forEach(function (att) {
      if (opts.attachments && opts.include_docs) {
        fetchAttachment(doc, att);
      } else {
        doc._attachments[att].stub = true;
        checkDone();
      }
    });
  }
  
  var POUCH_VERSION = 1;
  
  // these indexes cover the ground for most allDocs queries
  var BY_SEQ_STORE_DELETED_INDEX_SQL =
    'CREATE INDEX IF NOT EXISTS \'by-seq-deleted-idx\' ON ' +
    BY_SEQ_STORE + ' (seq, deleted)';
  var BY_SEQ_STORE_DOC_ID_REV_INDEX_SQL =
    'CREATE UNIQUE INDEX IF NOT EXISTS \'by-seq-doc-id-rev\' ON ' +
      BY_SEQ_STORE + ' (doc_id, rev)';
  var DOC_STORE_WINNINGSEQ_INDEX_SQL =
    'CREATE INDEX IF NOT EXISTS \'doc-winningseq-idx\' ON ' +
    DOC_STORE + ' (winningseq)';
  var ATTACH_AND_SEQ_STORE_SEQ_INDEX_SQL =
    'CREATE INDEX IF NOT EXISTS \'attach-seq-seq-idx\' ON ' +
      ATTACH_AND_SEQ_STORE + ' (seq)';
  var ATTACH_AND_SEQ_STORE_ATTACH_INDEX_SQL =
    'CREATE UNIQUE INDEX IF NOT EXISTS \'attach-seq-digest-idx\' ON ' +
      ATTACH_AND_SEQ_STORE + ' (digest, seq)';
  
  var DOC_STORE_AND_BY_SEQ_JOINER = BY_SEQ_STORE +
    '.seq = ' + DOC_STORE + '.winningseq';
  
  var SELECT_DOCS = BY_SEQ_STORE + '.seq AS seq, ' +
    BY_SEQ_STORE + '.deleted AS deleted, ' +
    BY_SEQ_STORE + '.json AS data, ' +
    BY_SEQ_STORE + '.rev AS rev, ' +
    DOC_STORE + '.json AS metadata';
  
  function WebSqlPouch(opts, callback) {
    var api = this;
    var instanceId = null;
    var size = getSize(opts);
    var idRequests = [];
    var encoding;
  
    api._docCount = -1; // cache sqlite count(*) for performance
    api._name = opts.name;
  
    var db = openDB({
      name: api._name,
      version: POUCH_VERSION,
      description: api._name,
      size: size,
      location: opts.location,
      createFromLocation: opts.createFromLocation
    });
    if (!db) {
      return callback(errors.error(errors.UNKNOWN_ERROR));
    } else if (typeof db.readTransaction !== 'function') {
      // doesn't exist in sqlite plugin
      db.readTransaction = db.transaction;
    }
  
    function dbCreated() {
      // note the db name in case the browser upgrades to idb
      if (utils.hasLocalStorage()) {
        window.localStorage['_pouch__websqldb_' + api._name] = true;
      }
      callback(null, api);
    }
  
    // In this migration, we added the 'deleted' and 'local' columns to the
    // by-seq and doc store tables.
    // To preserve existing user data, we re-process all the existing JSON
    // and add these values.
    // Called migration2 because it corresponds to adapter version (db_version) #2
    function runMigration2(tx, callback) {
      // index used for the join in the allDocs query
      tx.executeSql(DOC_STORE_WINNINGSEQ_INDEX_SQL);
  
      tx.executeSql('ALTER TABLE ' + BY_SEQ_STORE +
        ' ADD COLUMN deleted TINYINT(1) DEFAULT 0', [], function () {
        tx.executeSql(BY_SEQ_STORE_DELETED_INDEX_SQL);
        tx.executeSql('ALTER TABLE ' + DOC_STORE +
          ' ADD COLUMN local TINYINT(1) DEFAULT 0', [], function () {
          tx.executeSql('CREATE INDEX IF NOT EXISTS \'doc-store-local-idx\' ON ' +
            DOC_STORE + ' (local, id)');
  
          var sql = 'SELECT ' + DOC_STORE + '.winningseq AS seq, ' + DOC_STORE +
            '.json AS metadata FROM ' + BY_SEQ_STORE + ' JOIN ' + DOC_STORE +
            ' ON ' + BY_SEQ_STORE + '.seq = ' + DOC_STORE + '.winningseq';
  
          tx.executeSql(sql, [], function (tx, result) {
  
            var deleted = [];
            var local = [];
  
            for (var i = 0; i < result.rows.length; i++) {
              var item = result.rows.item(i);
              var seq = item.seq;
              var metadata = JSON.parse(item.metadata);
              if (utils.isDeleted(metadata)) {
                deleted.push(seq);
              }
              if (utils.isLocalId(metadata.id)) {
                local.push(metadata.id);
              }
            }
            tx.executeSql('UPDATE ' + DOC_STORE + 'SET local = 1 WHERE id IN ' +
              qMarks(local.length), local, function () {
              tx.executeSql('UPDATE ' + BY_SEQ_STORE +
                ' SET deleted = 1 WHERE seq IN ' +
                qMarks(deleted.length), deleted, callback);
            });
          });
        });
      });
    }
  
    // in this migration, we make all the local docs unversioned
    function runMigration3(tx, callback) {
      var local = 'CREATE TABLE IF NOT EXISTS ' + LOCAL_STORE +
        ' (id UNIQUE, rev, json)';
      tx.executeSql(local, [], function () {
        var sql = 'SELECT ' + DOC_STORE + '.id AS id, ' +
          BY_SEQ_STORE + '.json AS data ' +
          'FROM ' + BY_SEQ_STORE + ' JOIN ' +
          DOC_STORE + ' ON ' + BY_SEQ_STORE + '.seq = ' +
          DOC_STORE + '.winningseq WHERE local = 1';
        tx.executeSql(sql, [], function (tx, res) {
          var rows = [];
          for (var i = 0; i < res.rows.length; i++) {
            rows.push(res.rows.item(i));
          }
          function doNext() {
            if (!rows.length) {
              return callback(tx);
            }
            var row = rows.shift();
            var rev = JSON.parse(row.data)._rev;
            tx.executeSql('INSERT INTO ' + LOCAL_STORE +
                ' (id, rev, json) VALUES (?,?,?)',
                [row.id, rev, row.data], function (tx) {
              tx.executeSql('DELETE FROM ' + DOC_STORE + ' WHERE id=?',
                  [row.id], function (tx) {
                tx.executeSql('DELETE FROM ' + BY_SEQ_STORE + ' WHERE seq=?',
                    [row.seq], function () {
                  doNext();
                });
              });
            });
          }
          doNext();
        });
      });
    }
  
    // in this migration, we remove doc_id_rev and just use rev
    function runMigration4(tx, callback) {
  
      function updateRows(rows) {
        function doNext() {
          if (!rows.length) {
            return callback(tx);
          }
          var row = rows.shift();
          var doc_id_rev = parseHexString(row.hex, encoding);
          var idx = doc_id_rev.lastIndexOf('::');
          var doc_id = doc_id_rev.substring(0, idx);
          var rev = doc_id_rev.substring(idx + 2);
          var sql = 'UPDATE ' + BY_SEQ_STORE +
            ' SET doc_id=?, rev=? WHERE doc_id_rev=?';
          tx.executeSql(sql, [doc_id, rev, doc_id_rev], function () {
            doNext();
          });
        }
        doNext();
      }
  
      var sql = 'ALTER TABLE ' + BY_SEQ_STORE + ' ADD COLUMN doc_id';
      tx.executeSql(sql, [], function (tx) {
        var sql = 'ALTER TABLE ' + BY_SEQ_STORE + ' ADD COLUMN rev';
        tx.executeSql(sql, [], function (tx) {
          tx.executeSql(BY_SEQ_STORE_DOC_ID_REV_INDEX_SQL, [], function (tx) {
            var sql = 'SELECT hex(doc_id_rev) as hex FROM ' + BY_SEQ_STORE;
            tx.executeSql(sql, [], function (tx, res) {
              var rows = [];
              for (var i = 0; i < res.rows.length; i++) {
                rows.push(res.rows.item(i));
              }
              updateRows(rows);
            });
          });
        });
      });
    }
  
    // in this migration, we add the attach_and_seq table
    // for issue #2818
    function runMigration5(tx, callback) {
  
      function migrateAttsAndSeqs(tx) {
        // need to actually populate the table. this is the expensive part,
        // so as an optimization, check first that this database even
        // contains attachments
        var sql = 'SELECT COUNT(*) AS cnt FROM ' + ATTACH_STORE;
        tx.executeSql(sql, [], function (tx, res) {
          var count = res.rows.item(0).cnt;
          if (!count) {
            return callback(tx);
          }
  
          var offset = 0;
          var pageSize = 10;
          function nextPage() {
            var sql = select(
              SELECT_DOCS + ', ' + DOC_STORE + '.id AS id',
              [DOC_STORE, BY_SEQ_STORE],
              DOC_STORE_AND_BY_SEQ_JOINER,
              null,
              DOC_STORE + '.id '
            );
            sql += ' LIMIT ' + pageSize + ' OFFSET ' + offset;
            offset += pageSize;
            tx.executeSql(sql, [], function (tx, res) {
              if (!res.rows.length) {
                return callback(tx);
              }
              var digestSeqs = {};
              function addDigestSeq(digest, seq) {
                // uniq digest/seq pairs, just in case there are dups
                var seqs = digestSeqs[digest] = (digestSeqs[digest] || []);
                if (seqs.indexOf(seq) === -1) {
                  seqs.push(seq);
                }
              }
              for (var i = 0; i < res.rows.length; i++) {
                var row = res.rows.item(i);
                var doc = unstringifyDoc(row.data, row.id, row.rev);
                var atts = Object.keys(doc._attachments || {});
                for (var j = 0; j < atts.length; j++) {
                  var att = doc._attachments[atts[j]];
                  addDigestSeq(att.digest, row.seq);
                }
              }
              var digestSeqPairs = [];
              Object.keys(digestSeqs).forEach(function (digest) {
                var seqs = digestSeqs[digest];
                seqs.forEach(function (seq) {
                  digestSeqPairs.push([digest, seq]);
                });
              });
              if (!digestSeqPairs.length) {
                return nextPage();
              }
              var numDone = 0;
              digestSeqPairs.forEach(function (pair) {
                var sql = 'INSERT INTO ' + ATTACH_AND_SEQ_STORE +
                  ' (digest, seq) VALUES (?,?)';
                tx.executeSql(sql, pair, function () {
                  if (++numDone === digestSeqPairs.length) {
                    nextPage();
                  }
                });
              });
            });
          }
          nextPage();
        });
      }
  
      var attachAndRev = 'CREATE TABLE IF NOT EXISTS ' +
        ATTACH_AND_SEQ_STORE + ' (digest, seq INTEGER)';
      tx.executeSql(attachAndRev, [], function (tx) {
        tx.executeSql(
          ATTACH_AND_SEQ_STORE_ATTACH_INDEX_SQL, [], function (tx) {
            tx.executeSql(
              ATTACH_AND_SEQ_STORE_SEQ_INDEX_SQL, [],
              migrateAttsAndSeqs);
          });
      });
    }
  
    // in this migration, we use escapeBlob() and unescapeBlob()
    // instead of reading out the binary as HEX, which is slow
    function runMigration6(tx, callback) {
      var sql = 'ALTER TABLE ' + ATTACH_STORE +
        ' ADD COLUMN escaped TINYINT(1) DEFAULT 0';
      tx.executeSql(sql, [], callback);
    }
  
    // issue #3136, in this migration we need a "latest seq" as well
    // as the "winning seq" in the doc store
    function runMigration7(tx, callback) {
      var sql = 'ALTER TABLE ' + DOC_STORE +
        ' ADD COLUMN max_seq INTEGER';
      tx.executeSql(sql, [], function (tx) {
        var sql = 'UPDATE ' + DOC_STORE + ' SET max_seq=(SELECT MAX(seq) FROM ' +
          BY_SEQ_STORE + ' WHERE doc_id=id)';
        tx.executeSql(sql, [], function (tx) {
          // add unique index after filling, else we'll get a constraint
          // error when we do the ALTER TABLE
          var sql =
            'CREATE UNIQUE INDEX IF NOT EXISTS \'doc-max-seq-idx\' ON ' +
            DOC_STORE + ' (max_seq)';
          tx.executeSql(sql, [], callback);
        });
      });
    }
  
    function checkEncoding(tx, cb) {
      // UTF-8 on chrome/android, UTF-16 on safari < 7.1
      tx.executeSql('SELECT HEX("a") AS hex', [], function (tx, res) {
          var hex = res.rows.item(0).hex;
          encoding = hex.length === 2 ? 'UTF-8' : 'UTF-16';
          cb();
        }
      );
    }
  
    function onGetInstanceId() {
      while (idRequests.length > 0) {
        var idCallback = idRequests.pop();
        idCallback(null, instanceId);
      }
    }
  
    function onGetVersion(tx, dbVersion) {
      if (dbVersion === 0) {
        // initial schema
  
        var meta = 'CREATE TABLE IF NOT EXISTS ' + META_STORE +
          ' (dbid, db_version INTEGER)';
        var attach = 'CREATE TABLE IF NOT EXISTS ' + ATTACH_STORE +
          ' (digest UNIQUE, escaped TINYINT(1), body BLOB)';
        var attachAndRev = 'CREATE TABLE IF NOT EXISTS ' +
          ATTACH_AND_SEQ_STORE + ' (digest, seq INTEGER)';
        // TODO: migrate winningseq to INTEGER
        var doc = 'CREATE TABLE IF NOT EXISTS ' + DOC_STORE +
          ' (id unique, json, winningseq, max_seq INTEGER UNIQUE)';
        var seq = 'CREATE TABLE IF NOT EXISTS ' + BY_SEQ_STORE +
          ' (seq INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, ' +
          'json, deleted TINYINT(1), doc_id, rev)';
        var local = 'CREATE TABLE IF NOT EXISTS ' + LOCAL_STORE +
          ' (id UNIQUE, rev, json)';
  
        // creates
        tx.executeSql(attach);
        tx.executeSql(local);
        tx.executeSql(attachAndRev, [], function () {
          tx.executeSql(ATTACH_AND_SEQ_STORE_SEQ_INDEX_SQL);
          tx.executeSql(ATTACH_AND_SEQ_STORE_ATTACH_INDEX_SQL);
        });
        tx.executeSql(doc, [], function () {
          tx.executeSql(DOC_STORE_WINNINGSEQ_INDEX_SQL);
          tx.executeSql(seq, [], function () {
            tx.executeSql(BY_SEQ_STORE_DELETED_INDEX_SQL);
            tx.executeSql(BY_SEQ_STORE_DOC_ID_REV_INDEX_SQL);
            tx.executeSql(meta, [], function () {
              // mark the db version, and new dbid
              var initSeq = 'INSERT INTO ' + META_STORE +
                ' (db_version, dbid) VALUES (?,?)';
              instanceId = utils.uuid();
              var initSeqArgs = [ADAPTER_VERSION, instanceId];
              tx.executeSql(initSeq, initSeqArgs, function () {
                onGetInstanceId();
              });
            });
          });
        });
      } else { // version > 0
  
        var setupDone = function () {
          var migrated = dbVersion < ADAPTER_VERSION;
          if (migrated) {
            // update the db version within this transaction
            tx.executeSql('UPDATE ' + META_STORE + ' SET db_version = ' +
              ADAPTER_VERSION);
          }
          // notify db.id() callers
          var sql = 'SELECT dbid FROM ' + META_STORE;
          tx.executeSql(sql, [], function (tx, result) {
            instanceId = result.rows.item(0).dbid;
            onGetInstanceId();
          });
        };
  
        // would love to use promises here, but then websql
        // ends the transaction early
        var tasks = [
          runMigration2,
          runMigration3,
          runMigration4,
          runMigration5,
          runMigration6,
          runMigration7,
          setupDone
        ];
  
        // run each migration sequentially
        var i = dbVersion;
        var nextMigration = function (tx) {
          tasks[i - 1](tx, nextMigration);
          i++;
        };
        nextMigration(tx);
      }
    }
  
    function setup() {
      db.transaction(function (tx) {
        // first check the encoding
        checkEncoding(tx, function () {
          // then get the version
          fetchVersion(tx);
        });
      }, unknownError(callback), dbCreated);
    }
  
    function fetchVersion(tx) {
      var sql = 'SELECT sql FROM sqlite_master WHERE tbl_name = ' + META_STORE;
      tx.executeSql(sql, [], function (tx, result) {
        if (!result.rows.length) {
          // database hasn't even been created yet (version 0)
          onGetVersion(tx, 0);
        } else if (!/db_version/.test(result.rows.item(0).sql)) {
          // table was created, but without the new db_version column,
          // so add it.
          tx.executeSql('ALTER TABLE ' + META_STORE +
            ' ADD COLUMN db_version INTEGER', [], function () {
            // before version 2, this column didn't even exist
            onGetVersion(tx, 1);
          });
        } else { // column exists, we can safely get it
          tx.executeSql('SELECT db_version FROM ' + META_STORE,
            [], function (tx, result) {
            var dbVersion = result.rows.item(0).db_version;
            onGetVersion(tx, dbVersion);
          });
        }
      });
    }
  
    if (utils.isCordova()) {
      //to wait until custom api is made in pouch.adapters before doing setup
      window.addEventListener(api._name + '_pouch', function cordova_init() {
        window.removeEventListener(api._name + '_pouch', cordova_init, false);
        setup();
      }, false);
    } else {
      setup();
    }
  
    api.type = function () {
      return 'websql';
    };
  
    api._id = utils.toPromise(function (callback) {
      callback(null, instanceId);
    });
  
    api._info = function (callback) {
      db.readTransaction(function (tx) {
        countDocs(tx, function (docCount) {
          var sql = 'SELECT MAX(seq) AS seq FROM ' + BY_SEQ_STORE;
          tx.executeSql(sql, [], function (tx, res) {
            var updateSeq = res.rows.item(0).seq || 0;
            callback(null, {
              doc_count: docCount,
              update_seq: updateSeq,
              // for debugging
              sqlite_plugin: db._sqlitePlugin,
              websql_encoding: encoding
            });
          });
        });
      }, unknownError(callback));
    };
  
    api._bulkDocs = function (req, opts, callback) {
      websqlBulkDocs(req, opts, api, db, WebSqlPouch.Changes, callback);
    };
  
    api._get = function (id, opts, callback) {
      opts = utils.clone(opts);
      var doc;
      var metadata;
      var err;
      if (!opts.ctx) {
        db.readTransaction(function (txn) {
          opts.ctx = txn;
          api._get(id, opts, callback);
        });
        return;
      }
      var tx = opts.ctx;
  
      function finish() {
        callback(err, {doc: doc, metadata: metadata, ctx: tx});
      }
  
      var sql;
      var sqlArgs;
      if (opts.rev) {
        sql = select(
          SELECT_DOCS,
          [DOC_STORE, BY_SEQ_STORE],
          DOC_STORE + '.id=' + BY_SEQ_STORE + '.doc_id',
          [BY_SEQ_STORE + '.doc_id=?', BY_SEQ_STORE + '.rev=?']);
        sqlArgs = [id, opts.rev];
      } else {
        sql = select(
          SELECT_DOCS,
          [DOC_STORE, BY_SEQ_STORE],
          DOC_STORE_AND_BY_SEQ_JOINER,
          DOC_STORE + '.id=?');
        sqlArgs = [id];
      }
      tx.executeSql(sql, sqlArgs, function (a, results) {
        if (!results.rows.length) {
          err = errors.error(errors.MISSING_DOC, 'missing');
          return finish();
        }
        var item = results.rows.item(0);
        metadata = utils.safeJsonParse(item.metadata);
        if (item.deleted && !opts.rev) {
          err = errors.error(errors.MISSING_DOC, 'deleted');
          return finish();
        }
        doc = unstringifyDoc(item.data, metadata.id, item.rev);
        finish();
      });
    };
  
    function countDocs(tx, callback) {
  
      if (api._docCount !== -1) {
        return callback(api._docCount);
      }
  
      // count the total rows
      var sql = select(
        'COUNT(' + DOC_STORE + '.id) AS \'num\'',
        [DOC_STORE, BY_SEQ_STORE],
        DOC_STORE_AND_BY_SEQ_JOINER,
        BY_SEQ_STORE + '.deleted=0');
  
      tx.executeSql(sql, [], function (tx, result) {
        api._docCount = result.rows.item(0).num;
        callback(api._docCount);
      });
    }
  
    api._allDocs = function (opts, callback) {
      var results = [];
      var totalRows;
  
      var start = 'startkey' in opts ? opts.startkey : false;
      var end = 'endkey' in opts ? opts.endkey : false;
      var key = 'key' in opts ? opts.key : false;
      var descending = 'descending' in opts ? opts.descending : false;
      var limit = 'limit' in opts ? opts.limit : -1;
      var offset = 'skip' in opts ? opts.skip : 0;
      var inclusiveEnd = opts.inclusive_end !== false;
  
      var sqlArgs = [];
      var criteria = [];
  
      if (key !== false) {
        criteria.push(DOC_STORE + '.id = ?');
        sqlArgs.push(key);
      } else if (start !== false || end !== false) {
        if (start !== false) {
          criteria.push(DOC_STORE + '.id ' + (descending ? '<=' : '>=') + ' ?');
          sqlArgs.push(start);
        }
        if (end !== false) {
          var comparator = descending ? '>' : '<';
          if (inclusiveEnd) {
            comparator += '=';
          }
          criteria.push(DOC_STORE + '.id ' + comparator + ' ?');
          sqlArgs.push(end);
        }
        if (key !== false) {
          criteria.push(DOC_STORE + '.id = ?');
          sqlArgs.push(key);
        }
      }
  
      if (opts.deleted !== 'ok') {
        // report deleted if keys are specified
        criteria.push(BY_SEQ_STORE + '.deleted = 0');
      }
  
      db.readTransaction(function (tx) {
  
        // first count up the total rows
        countDocs(tx, function (count) {
          totalRows = count;
  
          if (limit === 0) {
            return;
          }
  
          // then actually fetch the documents
          var sql = select(
            SELECT_DOCS,
            [DOC_STORE, BY_SEQ_STORE],
            DOC_STORE_AND_BY_SEQ_JOINER,
            criteria,
            DOC_STORE + '.id ' + (descending ? 'DESC' : 'ASC')
            );
          sql += ' LIMIT ' + limit + ' OFFSET ' + offset;
  
          tx.executeSql(sql, sqlArgs, function (tx, result) {
            for (var i = 0, l = result.rows.length; i < l; i++) {
              var item = result.rows.item(i);
              var metadata = utils.safeJsonParse(item.metadata);
              var id = metadata.id;
              var data = unstringifyDoc(item.data, id, item.rev);
              var winningRev = data._rev;
              var doc = {
                id: id,
                key: id,
                value: {rev: winningRev}
              };
              if (opts.include_docs) {
                doc.doc = data;
                doc.doc._rev = winningRev;
                if (opts.conflicts) {
                  doc.doc._conflicts = merge.collectConflicts(metadata);
                }
                fetchAttachmentsIfNecessary(doc.doc, opts, api, tx);
              }
              if (item.deleted) {
                if (opts.deleted === 'ok') {
                  doc.value.deleted = true;
                  doc.doc = null;
                } else {
                  continue;
                }
              }
              results.push(doc);
            }
          });
        });
      }, unknownError(callback), function () {
        callback(null, {
          total_rows: totalRows,
          offset: opts.skip,
          rows: results
        });
      });
    };
  
    api._changes = function (opts) {
      opts = utils.clone(opts);
  
      if (opts.continuous) {
        var id = api._name + ':' + utils.uuid();
        WebSqlPouch.Changes.addListener(api._name, id, api, opts);
        WebSqlPouch.Changes.notify(api._name);
        return {
          cancel: function () {
            WebSqlPouch.Changes.removeListener(api._name, id);
          }
        };
      }
  
      var descending = opts.descending;
  
      // Ignore the `since` parameter when `descending` is true
      opts.since = opts.since && !descending ? opts.since : 0;
  
      var limit = 'limit' in opts ? opts.limit : -1;
      if (limit === 0) {
        limit = 1; // per CouchDB _changes spec
      }
  
      var returnDocs;
      if ('returnDocs' in opts) {
        returnDocs = opts.returnDocs;
      } else {
        returnDocs = true;
      }
      var results = [];
      var numResults = 0;
  
      function fetchChanges() {
  
        var selectStmt =
          DOC_STORE + '.json AS metadata, ' +
          DOC_STORE + '.max_seq AS maxSeq, ' +
          BY_SEQ_STORE + '.json AS winningDoc, ' +
          BY_SEQ_STORE + '.rev AS winningRev ';
  
        var from = DOC_STORE + ' JOIN ' + BY_SEQ_STORE;
  
        var joiner = DOC_STORE + '.id=' + BY_SEQ_STORE + '.doc_id' +
          ' AND ' + DOC_STORE + '.winningseq=' + BY_SEQ_STORE + '.seq';
  
        var criteria = ['maxSeq > ?'];
        var sqlArgs = [opts.since];
  
        if (opts.doc_ids) {
          criteria.push(DOC_STORE + '.id IN ' + qMarks(opts.doc_ids.length));
          sqlArgs = sqlArgs.concat(opts.doc_ids);
        }
  
        var orderBy = 'maxSeq ' + (descending ? 'DESC' : 'ASC');
  
        var sql = select(selectStmt, from, joiner, criteria, orderBy);
  
        var filter = utils.filterChange(opts);
        if (!opts.view && !opts.filter) {
          // we can just limit in the query
          sql += ' LIMIT ' + limit;
        }
  
        var lastSeq = opts.since || 0;
        db.readTransaction(function (tx) {
          tx.executeSql(sql, sqlArgs, function (tx, result) {
            function reportChange(change) {
              return function () {
                opts.onChange(change);
              };
            }
            for (var i = 0, l = result.rows.length; i < l; i++) {
              var item = result.rows.item(i);
              var metadata = utils.safeJsonParse(item.metadata);
              lastSeq = item.maxSeq;
  
              var doc = unstringifyDoc(item.winningDoc, metadata.id,
                item.winningRev);
              var change = opts.processChange(doc, metadata, opts);
              change.seq = item.maxSeq;
              if (filter(change)) {
                numResults++;
                if (returnDocs) {
                  results.push(change);
                }
                // process the attachment immediately
                // for the benefit of live listeners
                if (opts.attachments && opts.include_docs) {
                  fetchAttachmentsIfNecessary(doc, opts, api, tx,
                    reportChange(change));
                } else {
                  reportChange(change)();
                }
              }
              if (numResults === limit) {
                break;
              }
            }
          });
        }, unknownError(opts.complete), function () {
          if (!opts.continuous) {
            opts.complete(null, {
              results: results,
              last_seq: lastSeq
            });
          }
        });
      }
  
      fetchChanges();
    };
  
    api._close = function (callback) {
      //WebSQL databases do not need to be closed
      callback();
    };
  
    api._getAttachment = function (attachment, opts, callback) {
      var res;
      var tx = opts.ctx;
      var digest = attachment.digest;
      var type = attachment.content_type;
      var sql = 'SELECT escaped, ' +
        'CASE WHEN escaped = 1 THEN body ELSE HEX(body) END AS body FROM ' +
        ATTACH_STORE + ' WHERE digest=?';
      tx.executeSql(sql, [digest], function (tx, result) {
        // websql has a bug where \u0000 causes early truncation in strings
        // and blobs. to work around this, we used to use the hex() function,
        // but that's not performant. after migration 6, we remove \u0000
        // and add it back in afterwards
        var item = result.rows.item(0);
        var data = item.escaped ? websqlUtils.unescapeBlob(item.body) :
          parseHexString(item.body, encoding);
        if (opts.encode) {
          res = btoa(data);
        } else {
          data = utils.fixBinary(data);
          res = utils.createBlob([data], {type: type});
        }
        callback(null, res);
      });
    };
  
    api._getRevisionTree = function (docId, callback) {
      db.readTransaction(function (tx) {
        var sql = 'SELECT json AS metadata FROM ' + DOC_STORE + ' WHERE id = ?';
        tx.executeSql(sql, [docId], function (tx, result) {
          if (!result.rows.length) {
            callback(errors.error(errors.MISSING_DOC));
          } else {
            var data = utils.safeJsonParse(result.rows.item(0).metadata);
            callback(null, data.rev_tree);
          }
        });
      });
    };
  
    api._doCompaction = function (docId, revs, callback) {
      if (!revs.length) {
        return callback();
      }
      db.transaction(function (tx) {
  
        // update doc store
        var sql = 'SELECT json AS metadata FROM ' + DOC_STORE + ' WHERE id = ?';
        tx.executeSql(sql, [docId], function (tx, result) {
          var metadata = utils.safeJsonParse(result.rows.item(0).metadata);
          merge.traverseRevTree(metadata.rev_tree, function (isLeaf, pos,
                                                             revHash, ctx, opts) {
            var rev = pos + '-' + revHash;
            if (revs.indexOf(rev) !== -1) {
              opts.status = 'missing';
            }
          });
  
          var sql = 'UPDATE ' + DOC_STORE + ' SET json = ? WHERE id = ?';
          tx.executeSql(sql, [utils.safeJsonStringify(metadata), docId]);
        });
  
        compactRevs(revs, docId, tx);
      }, unknownError(callback), function () {
        callback();
      });
    };
  
    api._getLocal = function (id, callback) {
      db.readTransaction(function (tx) {
        var sql = 'SELECT json, rev FROM ' + LOCAL_STORE + ' WHERE id=?';
        tx.executeSql(sql, [id], function (tx, res) {
          if (res.rows.length) {
            var item = res.rows.item(0);
            var doc = unstringifyDoc(item.json, id, item.rev);
            callback(null, doc);
          } else {
            callback(errors.error(errors.MISSING_DOC));
          }
        });
      });
    };
  
    api._putLocal = function (doc, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      delete doc._revisions; // ignore this, trust the rev
      var oldRev = doc._rev;
      var id = doc._id;
      var newRev;
      if (!oldRev) {
        newRev = doc._rev = '0-1';
      } else {
        newRev = doc._rev = '0-' + (parseInt(oldRev.split('-')[1], 10) + 1);
      }
      var json = stringifyDoc(doc);
  
      var ret;
      function putLocal(tx) {
        var sql;
        var values;
        if (oldRev) {
          sql = 'UPDATE ' + LOCAL_STORE + ' SET rev=?, json=? ' +
            'WHERE id=? AND rev=?';
          values = [newRev, json, id, oldRev];
        } else {
          sql = 'INSERT INTO ' + LOCAL_STORE + ' (id, rev, json) VALUES (?,?,?)';
          values = [id, newRev, json];
        }
        tx.executeSql(sql, values, function (tx, res) {
          if (res.rowsAffected) {
            ret = {ok: true, id: id, rev: newRev};
            if (opts.ctx) { // return immediately
              callback(null, ret);
            }
          } else {
            callback(errors.error(errors.REV_CONFLICT));
          }
        }, function () {
          callback(errors.error(errors.REV_CONFLICT));
          return false; // ack that we handled the error
        });
      }
  
      if (opts.ctx) {
        putLocal(opts.ctx);
      } else {
        db.transaction(function (tx) {
          putLocal(tx);
        }, unknownError(callback), function () {
          if (ret) {
            callback(null, ret);
          }
        });
      }
    };
  
    api._removeLocal = function (doc, callback) {
      var ret;
      db.transaction(function (tx) {
        var sql = 'DELETE FROM ' + LOCAL_STORE + ' WHERE id=? AND rev=?';
        var params = [doc._id, doc._rev];
        tx.executeSql(sql, params, function (tx, res) {
          if (!res.rowsAffected) {
            return callback(errors.error(errors.MISSING_DOC));
          }
          ret = {ok: true, id: doc._id, rev: '0-0'};
        });
      }, unknownError(callback), function () {
        if (ret) {
          callback(null, ret);
        }
      });
    };
  
    api._destroy = function (callback) {
      WebSqlPouch.Changes.removeAllListeners(api._name);
      db.transaction(function (tx) {
        var stores = [DOC_STORE, BY_SEQ_STORE, ATTACH_STORE, META_STORE,
          LOCAL_STORE, ATTACH_AND_SEQ_STORE];
        stores.forEach(function (store) {
          tx.executeSql('DROP TABLE IF EXISTS ' + store, []);
        });
      }, unknownError(callback), function () {
        if (utils.hasLocalStorage()) {
          delete window.localStorage['_pouch__websqldb_' + api._name];
          delete window.localStorage[api._name];
        }
        callback(null, {'ok': true});
      });
    };
  }
  
  WebSqlPouch.valid = websqlUtils.valid;
  
  WebSqlPouch.Changes = new utils.Changes();
  
  module.exports = WebSqlPouch;
  
  },{"10":10,"11":11,"19":19,"23":23,"31":31,"36":36,"9":9}],13:[function(_dereq_,module,exports){
  'use strict';
  var utils = _dereq_(36);
  var merge = _dereq_(31);
  var errors = _dereq_(19);
  var EE = _dereq_(40).EventEmitter;
  var evalFilter = _dereq_(29);
  var evalView = _dereq_(30);
  module.exports = Changes;
  utils.inherits(Changes, EE);
  
  function Changes(db, opts, callback) {
    EE.call(this);
    var self = this;
    this.db = db;
    opts = opts ? utils.clone(opts) : {};
    var oldComplete = callback || opts.complete || function () {};
    var complete = opts.complete = utils.once(function (err, resp) {
      if (err) {
        self.emit('error', err);
      } else {
        self.emit('complete', resp);
      }
      self.removeAllListeners();
      db.removeListener('destroyed', onDestroy);
    });
    if (oldComplete) {
      self.on('complete', function (resp) {
        oldComplete(null, resp);
      });
      self.on('error', function (err) {
        oldComplete(err);
      });
    }
    var oldOnChange = opts.onChange;
    if (oldOnChange) {
      self.on('change', oldOnChange);
    }
    function onDestroy() {
      self.cancel();
    }
    db.once('destroyed', onDestroy);
  
    opts.onChange = function (change) {
      if (opts.isCancelled) {
        return;
      }
      self.emit('change', change);
      if (self.startSeq && self.startSeq <= change.seq) {
        self.emit('uptodate');
        self.startSeq = false;
      }
      if (change.deleted) {
        self.emit('delete', change);
      } else if (change.changes.length === 1 &&
        change.changes[0].rev.slice(0, 2) === '1-') {
        self.emit('create', change);
      } else {
        self.emit('update', change);
      }
    };
  
    var promise = new utils.Promise(function (fulfill, reject) {
      opts.complete = function (err, res) {
        if (err) {
          reject(err);
        } else {
          fulfill(res);
        }
      };
    });
    self.once('cancel', function () {
      if (oldOnChange) {
        self.removeListener('change', oldOnChange);
      }
      opts.complete(null, {status: 'cancelled'});
    });
    this.then = promise.then.bind(promise);
    this['catch'] = promise['catch'].bind(promise);
    this.then(function (result) {
      complete(null, result);
    }, complete);
  
  
  
    if (!db.taskqueue.isReady) {
      db.taskqueue.addTask(function () {
        if (self.isCancelled) {
          self.emit('cancel');
        } else {
          self.doChanges(opts);
        }
      });
    } else {
      self.doChanges(opts);
    }
  }
  Changes.prototype.cancel = function () {
    this.isCancelled = true;
    if (this.db.taskqueue.isReady) {
      this.emit('cancel');
    }
  };
  function processChange(doc, metadata, opts) {
    var changeList = [{rev: doc._rev}];
    if (opts.style === 'all_docs') {
      changeList = merge.collectLeaves(metadata.rev_tree)
      .map(function (x) { return {rev: x.rev}; });
    }
    var change = {
      id: metadata.id,
      changes: changeList,
      doc: doc
    };
  
    if (utils.isDeleted(metadata, doc._rev)) {
      change.deleted = true;
    }
    if (opts.conflicts) {
      change.doc._conflicts = merge.collectConflicts(metadata);
      if (!change.doc._conflicts.length) {
        delete change.doc._conflicts;
      }
    }
    return change;
  }
  
  Changes.prototype.doChanges = function (opts) {
    var self = this;
    var callback = opts.complete;
  
    opts = utils.clone(opts);
    if ('live' in opts && !('continuous' in opts)) {
      opts.continuous = opts.live;
    }
    opts.processChange = processChange;
  
    if (opts.since === 'latest') {
      opts.since = 'now';
    }
    if (!opts.since) {
      opts.since = 0;
    }
    if (opts.since === 'now') {
      this.db.info().then(function (info) {
        if (self.isCancelled) {
          callback(null, {status: 'cancelled'});
          return;
        }
        opts.since = info.update_seq;
        self.doChanges(opts);
      }, callback);
      return;
    }
  
    if (opts.continuous && opts.since !== 'now') {
      this.db.info().then(function (info) {
        self.startSeq = info.update_seq;
      }, function (err) {
        if (err.id === 'idbNull') {
          //db closed before this returned
          //thats ok
          return;
        }
        throw err;
      });
    }
  
    if (this.db.type() !== 'http' &&
        opts.filter && typeof opts.filter === 'string' &&
        !opts.doc_ids) {
      return this.filterChanges(opts);
    }
  
    if (!('descending' in opts)) {
      opts.descending = false;
    }
  
    // 0 and 1 should return 1 document
    opts.limit = opts.limit === 0 ? 1 : opts.limit;
    opts.complete = callback;
    var newPromise = this.db._changes(opts);
    if (newPromise && typeof newPromise.cancel === 'function') {
      var cancel = self.cancel;
      self.cancel = utils.getArguments(function (args) {
        newPromise.cancel();
        cancel.apply(this, args);
      });
    }
  };
  
  Changes.prototype.filterChanges = function (opts) {
    var self = this;
    var callback = opts.complete;
    if (opts.filter === '_view') {
      if (!opts.view || typeof opts.view !== 'string') {
        var err = errors.error(errors.BAD_REQUEST,
                               '`view` filter parameter is not provided.');
        callback(err);
        return;
      }
      // fetch a view from a design doc, make it behave like a filter
      var viewName = opts.view.split('/');
      this.db.get('_design/' + viewName[0], function (err, ddoc) {
        if (self.isCancelled) {
          callback(null, {status: 'cancelled'});
          return;
        }
        if (err) {
          callback(errors.generateErrorFromResponse(err));
          return;
        }
        if (ddoc && ddoc.views && ddoc.views[viewName[1]]) {
          
          var filter = evalView(ddoc.views[viewName[1]].map);
          opts.filter = filter;
          self.doChanges(opts);
          return;
        }
        var msg = ddoc.views ? 'missing json key: ' + viewName[1] :
          'missing json key: views';
        if (!err) {
          err = errors.error(errors.MISSING_DOC, msg);
        }
        callback(err);
        return;
      });
    } else {
      // fetch a filter from a design doc
      var filterName = opts.filter.split('/');
      this.db.get('_design/' + filterName[0], function (err, ddoc) {
        if (self.isCancelled) {
          callback(null, {status: 'cancelled'});
          return;
        }
        if (err) {
          callback(errors.generateErrorFromResponse(err));
          return;
        }
        if (ddoc && ddoc.filters && ddoc.filters[filterName[1]]) {
          var filter = evalFilter(ddoc.filters[filterName[1]]);
          opts.filter = filter;
          self.doChanges(opts);
          return;
        } else {
          var msg = (ddoc && ddoc.filters) ? 'missing json key: ' + filterName[1]
            : 'missing json key: filters';
          if (!err) {
            err = errors.error(errors.MISSING_DOC, msg);
          }
          callback(err);
          return;
        }
      });
    }
  };
  },{"19":19,"29":29,"30":30,"31":31,"36":36,"40":40}],14:[function(_dereq_,module,exports){
  'use strict';
  
  var Promise = _dereq_(25);
  var explain404 = _dereq_(20);
  var pouchCollate = _dereq_(64);
  var collate = pouchCollate.collate;
  
  function updateCheckpoint(db, id, checkpoint, returnValue) {
    return db.get(id)["catch"](function (err) {
      if (err.status === 404) {
        if (db.type() === 'http') {
          explain404(
            'PouchDB is just checking if a remote checkpoint exists.');
        }
        return {_id: id};
      }
      throw err;
    }).then(function (doc) {
      if (returnValue.cancelled) {
        return;
      }
      doc.last_seq = checkpoint;
      return db.put(doc)["catch"](function (err) {
        if (err.status === 409) {
          // retry; someone is trying to write a checkpoint simultaneously
          return updateCheckpoint(db, id, checkpoint, returnValue);
        }
        throw err;
      });
    });
  }
  
  function Checkpointer(src, target, id, returnValue) {
    this.src = src;
    this.target = target;
    this.id = id;
    this.returnValue = returnValue;
  }
  
  Checkpointer.prototype.writeCheckpoint = function (checkpoint) {
    var self = this;
    return this.updateTarget(checkpoint).then(function () {
      return self.updateSource(checkpoint);
    });
  };
  
  Checkpointer.prototype.updateTarget = function (checkpoint) {
    return updateCheckpoint(this.target, this.id, checkpoint, this.returnValue);
  };
  
  Checkpointer.prototype.updateSource = function (checkpoint) {
    var self = this;
    if (this.readOnlySource) {
      return Promise.resolve(true);
    }
    return updateCheckpoint(this.src, this.id, checkpoint, this.returnValue)[
      "catch"](function (err) {
        var isForbidden = typeof err.status === 'number' &&
          Math.floor(err.status / 100) === 4;
        if (isForbidden) {
          self.readOnlySource = true;
          return true;
        }
        throw err;
      });
  };
  
  Checkpointer.prototype.getCheckpoint = function () {
    var self = this;
    return self.target.get(self.id).then(function (targetDoc) {
      return self.src.get(self.id).then(function (sourceDoc) {
        if (collate(targetDoc.last_seq, sourceDoc.last_seq) === 0) {
          return sourceDoc.last_seq;
        }
        return 0;
      }, function (err) {
        if (err.status === 404 && targetDoc.last_seq) {
          return self.src.put({
            _id: self.id,
            last_seq: 0
          }).then(function () {
            return 0;
          }, function (err) {
            if (err.status === 401) {
              self.readOnlySource = true;
              return targetDoc.last_seq;
            }
            return 0;
          });
        }
        throw err;
      });
    })["catch"](function (err) {
      if (err.status !== 404) {
        throw err;
      }
      return 0;
    });
  };
  
  module.exports = Checkpointer;
  
  },{"20":20,"25":25,"64":64}],15:[function(_dereq_,module,exports){
  (function (process,global){
  /*globals cordova */
  "use strict";
  
  var Adapter = _dereq_(1);
  var utils = _dereq_(36);
  var TaskQueue = _dereq_(35);
  var Promise = utils.Promise;
  
  function defaultCallback(err) {
    if (err && global.debug) {
      console.error(err);
    }
  }
  
  utils.inherits(PouchDB, Adapter);
  function PouchDB(name, opts, callback) {
  
    if (!(this instanceof PouchDB)) {
      return new PouchDB(name, opts, callback);
    }
    var self = this;
    if (typeof opts === 'function' || typeof opts === 'undefined') {
      callback = opts;
      opts = {};
    }
  
    if (name && typeof name === 'object') {
      opts = name;
      name = undefined;
    }
    if (typeof callback === 'undefined') {
      callback = defaultCallback;
    }
    name = name || opts.name;
    opts = opts ? utils.clone(opts) : {};
    // if name was specified via opts, ignore for the sake of dependentDbs
    delete opts.name;
    this.__opts = opts;
    var oldCB = callback;
    self.auto_compaction = opts.auto_compaction;
    self.prefix = PouchDB.prefix;
    Adapter.call(self);
    self.taskqueue = new TaskQueue();
    var promise = new Promise(function (fulfill, reject) {
      callback = function (err, resp) {
        if (err) {
          return reject(err);
        }
        delete resp.then;
        fulfill(resp);
      };
    
      opts = utils.clone(opts);
      var originalName = opts.name || name;
      var backend, error;
      (function () {
        try {
  
          if (typeof originalName !== 'string') {
            error = new Error('Missing/invalid DB name');
            error.code = 400;
            throw error;
          }
  
          backend = PouchDB.parseAdapter(originalName, opts);
          
          opts.originalName = originalName;
          opts.name = backend.name;
          if (opts.prefix && backend.adapter !== 'http' &&
              backend.adapter !== 'https') {
            opts.name = opts.prefix + opts.name;
          }
          opts.adapter = opts.adapter || backend.adapter;
          self._adapter = opts.adapter;
          self._db_name = originalName;
          if (!PouchDB.adapters[opts.adapter]) {
            error = new Error('Adapter is missing');
            error.code = 404;
            throw error;
          }
  
          if (!PouchDB.adapters[opts.adapter].valid()) {
            error = new Error('Invalid Adapter');
            error.code = 404;
            throw error;
          }
        } catch (err) {
          self.taskqueue.fail(err);
          self.changes = utils.toPromise(function (opts) {
            if (opts.complete) {
              opts.complete(err);
            }
          });
        }
      }());
      if (error) {
        return reject(error); // constructor error, see above
      }
      self.adapter = opts.adapter;
  
      // needs access to PouchDB;
      self.replicate = {};
  
      self.replicate.from = function (url, opts, callback) {
        return self.constructor.replicate(url, self, opts, callback);
      };
  
      self.replicate.to = function (url, opts, callback) {
        return self.constructor.replicate(self, url, opts, callback);
      };
  
      self.sync = function (dbName, opts, callback) {
        return self.constructor.sync(self, dbName, opts, callback);
      };
  
      self.replicate.sync = self.sync;
  
      PouchDB.adapters[opts.adapter].call(self, opts, function (err) {
        if (err) {
          if (callback) {
            self.taskqueue.fail(err);
            callback(err);
          }
          return;
        }
        function destructionListener() {
          PouchDB.emit('destroyed', opts.originalName);
          //so we don't have to sift through all dbnames
          PouchDB.emit(opts.originalName, 'destroyed');
          self.removeListener('destroyed', destructionListener);
        }
        self.on('destroyed', destructionListener);
        self.emit('created', self);
        PouchDB.emit('created', opts.originalName);
        self.taskqueue.ready(self);
        callback(null, self);
      });
  
      if (opts.skipSetup) {
        self.taskqueue.ready(self);
        process.nextTick(function () {
          callback(null, self);
        });
      }
  
      if (utils.isCordova()) {
        //to inform websql adapter that we can use api
        cordova.fireWindowEvent(opts.name + "_pouch", {});
      }
    });
    promise.then(function (resp) {
      oldCB(null, resp);
    }, oldCB);
    self.then = promise.then.bind(promise);
    self["catch"] = promise["catch"].bind(promise);
  }
  
  PouchDB.debug = _dereq_(42);
  
  module.exports = PouchDB;
  
  }).call(this,_dereq_(41),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"1":1,"35":35,"36":36,"41":41,"42":42}],16:[function(_dereq_,module,exports){
  (function (process){
  "use strict";
  
  var request = _dereq_(26);
  
  var buffer = _dereq_(18);
  var errors = _dereq_(19);
  var utils = _dereq_(36);
  
  function ajax(options, adapterCallback) {
  
    var requestCompleted = false;
    var callback = utils.getArguments(function (args) {
      if (requestCompleted) {
        return;
      }
      adapterCallback.apply(this, args);
      requestCompleted = true;
    });
  
    if (typeof options === "function") {
      callback = options;
      options = {};
    }
  
    options = utils.clone(options);
  
    var defaultOptions = {
      method : "GET",
      headers: {},
      json: true,
      processData: true,
      timeout: 10000,
      cache: false
    };
  
    options = utils.extend(true, defaultOptions, options);
  
  
    function onSuccess(obj, resp, cb) {
      if (!options.binary && !options.json && options.processData &&
        typeof obj !== 'string') {
        obj = JSON.stringify(obj);
      } else if (!options.binary && options.json && typeof obj === 'string') {
        try {
          obj = JSON.parse(obj);
        } catch (e) {
          // Probably a malformed JSON from server
          return cb(e);
        }
      }
      if (Array.isArray(obj)) {
        obj = obj.map(function (v) {
          if (v.error || v.missing) {
            return errors.generateErrorFromResponse(v);
          } else {
            return v;
          }
        });
      }
      cb(null, obj, resp);
    }
  
    function onError(err, cb) {
      var errParsed, errObj;
      if (err.code && err.status) {
        var err2 = new Error(err.message || err.code);
        err2.status = err.status;
        return cb(err2);
      }
      try {
        errParsed = JSON.parse(err.responseText);
        //would prefer not to have a try/catch clause
        errObj = errors.generateErrorFromResponse(errParsed);
      } catch (e) {
        errObj = errors.generateErrorFromResponse(err);
      }
      cb(errObj);
    }
  
  
    if (options.json) {
      if (!options.binary) {
        options.headers.Accept = 'application/json';
      }
      options.headers['Content-Type'] = options.headers['Content-Type'] ||
        'application/json';
    }
  
    if (options.binary) {
      options.encoding = null;
      options.json = false;
    }
  
    if (!options.processData) {
      options.json = false;
    }
  
    function defaultBody(data) {
      if (process.browser) {
        return '';
      }
      return new buffer('', 'binary');
    }
  
    return request(options, function (err, response, body) {
      if (err) {
        err.status = response ? response.statusCode : 400;
        return onError(err, callback);
      }
  
      var error;
      var content_type = response.headers && response.headers['content-type'];
      var data = body || defaultBody();
  
      // CouchDB doesn't always return the right content-type for JSON data, so
      // we check for ^{ and }$ (ignoring leading/trailing whitespace)
      if (!options.binary && (options.json || !options.processData) &&
          typeof data !== 'object' &&
          (/json/.test(content_type) ||
           (/^[\s]*\{/.test(data) && /\}[\s]*$/.test(data)))) {
        data = JSON.parse(data);
      }
  
      if (response.statusCode >= 200 && response.statusCode < 300) {
        onSuccess(data, response, callback);
      } else {
        if (options.binary) {
          data = JSON.parse(data.toString());
        }
        error = errors.generateErrorFromResponse(data);
        error.status = response.statusCode;
        callback(error);
      }
    });
  }
  
  module.exports = ajax;
  
  }).call(this,_dereq_(41))
  },{"18":18,"19":19,"26":26,"36":36,"41":41}],17:[function(_dereq_,module,exports){
  (function (global){
  "use strict";
  
  //Abstracts constructing a Blob object, so it also works in older
  //browsers that don't support the native Blob constructor. (i.e.
  //old QtWebKit versions, at least).
  function createBlob(parts, properties) {
    parts = parts || [];
    properties = properties || {};
    try {
      return new Blob(parts, properties);
    } catch (e) {
      if (e.name !== "TypeError") {
        throw e;
      }
      var BlobBuilder = global.BlobBuilder ||
                        global.MSBlobBuilder ||
                        global.MozBlobBuilder ||
                        global.WebKitBlobBuilder;
      var builder = new BlobBuilder();
      for (var i = 0; i < parts.length; i += 1) {
        builder.append(parts[i]);
      }
      return builder.getBlob(properties.type);
    }
  }
  
  module.exports = createBlob;
  
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],18:[function(_dereq_,module,exports){
  // hey guess what, we don't need this in the browser
  module.exports = {};
  },{}],19:[function(_dereq_,module,exports){
  "use strict";
  
  var inherits = _dereq_(45);
  inherits(PouchError, Error);
  
  function PouchError(opts) {
    Error.call(opts.reason);
    this.status = opts.status;
    this.name = opts.error;
    this.message = opts.reason;
    this.error = true;
  }
  
  PouchError.prototype.toString = function () {
    return JSON.stringify({
      status: this.status,
      name: this.name,
      message: this.message
    });
  };
  
  exports.UNAUTHORIZED = new PouchError({
    status: 401,
    error: 'unauthorized',
    reason: "Name or password is incorrect."
  });
  
  exports.MISSING_BULK_DOCS = new PouchError({
    status: 400,
    error: 'bad_request',
    reason: "Missing JSON list of 'docs'"
  });
  
  exports.MISSING_DOC = new PouchError({
    status: 404,
    error: 'not_found',
    reason: 'missing'
  });
  
  exports.REV_CONFLICT = new PouchError({
    status: 409,
    error: 'conflict',
    reason: 'Document update conflict'
  });
  
  exports.INVALID_ID = new PouchError({
    status: 400,
    error: 'invalid_id',
    reason: '_id field must contain a string'
  });
  
  exports.MISSING_ID = new PouchError({
    status: 412,
    error: 'missing_id',
    reason: '_id is required for puts'
  });
  
  exports.RESERVED_ID = new PouchError({
    status: 400,
    error: 'bad_request',
    reason: 'Only reserved document ids may start with underscore.'
  });
  
  exports.NOT_OPEN = new PouchError({
    status: 412,
    error: 'precondition_failed',
    reason: 'Database not open'
  });
  
  exports.UNKNOWN_ERROR = new PouchError({
    status: 500,
    error: 'unknown_error',
    reason: 'Database encountered an unknown error'
  });
  
  exports.BAD_ARG = new PouchError({
    status: 500,
    error: 'badarg',
    reason: 'Some query argument is invalid'
  });
  
  exports.INVALID_REQUEST = new PouchError({
    status: 400,
    error: 'invalid_request',
    reason: 'Request was invalid'
  });
  
  exports.QUERY_PARSE_ERROR = new PouchError({
    status: 400,
    error: 'query_parse_error',
    reason: 'Some query parameter is invalid'
  });
  
  exports.DOC_VALIDATION = new PouchError({
    status: 500,
    error: 'doc_validation',
    reason: 'Bad special document member'
  });
  
  exports.BAD_REQUEST = new PouchError({
    status: 400,
    error: 'bad_request',
    reason: 'Something wrong with the request'
  });
  
  exports.NOT_AN_OBJECT = new PouchError({
    status: 400,
    error: 'bad_request',
    reason: 'Document must be a JSON object'
  });
  
  exports.DB_MISSING = new PouchError({
    status: 404,
    error: 'not_found',
    reason: 'Database not found'
  });
  
  exports.IDB_ERROR = new PouchError({
    status: 500,
    error: 'indexed_db_went_bad',
    reason: 'unknown'
  });
  
  exports.WSQ_ERROR = new PouchError({
    status: 500,
    error: 'web_sql_went_bad',
    reason: 'unknown'
  });
  
  exports.LDB_ERROR = new PouchError({
    status: 500,
    error: 'levelDB_went_went_bad',
    reason: 'unknown'
  });
  
  exports.FORBIDDEN = new PouchError({
    status: 403,
    error: 'forbidden',
    reason: 'Forbidden by design doc validate_doc_update function'
  });
  
  exports.INVALID_REV = new PouchError({
    status: 400,
    error: 'bad_request',
    reason: 'Invalid rev format'
  });
  
  exports.FILE_EXISTS = new PouchError({
    status: 412,
    error: 'file_exists',
    reason: 'The database could not be created, the file already exists.'
  });
  
  exports.MISSING_STUB = new PouchError({
    status: 412,
    error: 'missing_stub'
  });
  
  exports.error = function (error, reason, name) {
    function CustomPouchError(reason) {
      // inherit error properties from our parent error manually
      // so as to allow proper JSON parsing.
      /* jshint ignore:start */
      for (var p in error) {
        if (typeof error[p] !== 'function') {
          this[p] = error[p];
        }
      }
      /* jshint ignore:end */
      if (name !== undefined) {
        this.name = name;
      }
      if (reason !== undefined) {
        this.reason = reason;
      }
    }
    CustomPouchError.prototype = PouchError.prototype;
    return new CustomPouchError(reason);
  };
  
  // Find one of the errors defined above based on the value
  // of the specified property.
  // If reason is provided prefer the error matching that reason.
  // This is for differentiating between errors with the same name and status,
  // eg, bad_request.
  exports.getErrorTypeByProp = function (prop, value, reason) {
    var errors = exports;
    var keys = Object.keys(errors).filter(function (key) {
      var error = errors[key];
      return typeof error !== 'function' && error[prop] === value;
    });
    var key = reason && keys.filter(function (key) {
          var error = errors[key];
          return error.message === reason;
        })[0] || keys[0];
    return (key) ? errors[key] : null;
  };
  
  exports.generateErrorFromResponse = function (res) {
    var error, errName, errType, errMsg, errReason;
    var errors = exports;
  
    errName = (res.error === true && typeof res.name === 'string') ?
                res.name :
                res.error;
    errReason = res.reason;
    errType = errors.getErrorTypeByProp('name', errName, errReason);
  
    if (res.missing ||
        errReason === 'missing' ||
        errReason === 'deleted' ||
        errName === 'not_found') {
      errType = errors.MISSING_DOC;
    } else if (errName === 'doc_validation') {
      // doc validation needs special treatment since
      // res.reason depends on the validation error.
      // see utils.js
      errType = errors.DOC_VALIDATION;
      errMsg = errReason;
    } else if (errName === 'bad_request' && errType.message !== errReason) {
      // if bad_request error already found based on reason don't override.
  
      // attachment errors.
      if (errReason.indexOf('unknown stub attachment') === 0) {
        errType = errors.MISSING_STUB;
        errMsg = errReason;
      } else {
        errType = errors.BAD_REQUEST;
      }
    }
  
    // fallback to error by statys or unknown error.
    if (!errType) {
      errType = errors.getErrorTypeByProp('status', res.status, errReason) ||
                  errors.UNKNOWN_ERROR;
    }
  
    error = errors.error(errType, errReason, errName);
  
    // Keep custom message.
    if (errMsg) {
      error.message = errMsg;
    }
  
    // Keep helpful response data in our error messages.
    if (res.id) {
      error.id = res.id;
    }
    if (res.status) {
      error.status = res.status;
    }
    if (res.statusText) {
      error.name = res.statusText;
    }
    if (res.missing) {
      error.missing = res.missing;
    }
  
    return error;
  };
  
  },{"45":45}],20:[function(_dereq_,module,exports){
  (function (process,global){
  'use strict';
  
  // designed to give info to browser users, who are disturbed
  // when they see 404s in the console
  function explain404(str) {
    if (process.browser && 'console' in global && 'info' in console) {
      console.info('The above 404 is totally normal. ' + str);
    }
  }
  
  module.exports = explain404;
  }).call(this,_dereq_(41),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"41":41}],21:[function(_dereq_,module,exports){
  (function (process,global){
  'use strict';
  
  var crypto = _dereq_(39);
  var Md5 = _dereq_(75);
  var setImmediateShim = global.setImmediate || global.setTimeout;
  var MD5_CHUNK_SIZE = 32768;
  
  // convert a 64-bit int to a binary string
  function intToString(int) {
    var bytes = [
      (int & 0xff),
      ((int >>> 8) & 0xff),
      ((int >>> 16) & 0xff),
      ((int >>> 24) & 0xff)
    ];
    return bytes.map(function (byte) {
      return String.fromCharCode(byte);
    }).join('');
  }
  
  // convert an array of 64-bit ints into
  // a base64-encoded string
  function rawToBase64(raw) {
    var res = '';
    for (var i = 0; i < raw.length; i++) {
      res += intToString(raw[i]);
    }
    return btoa(res);
  }
  
  function appendBuffer(buffer, data, start, end) {
    if (start > 0 || end < data.byteLength) {
      // only create a subarray if we really need to
      data = new Uint8Array(data, start,
        Math.min(end, data.byteLength) - start);
    }
    buffer.append(data);
  }
  
  function appendString(buffer, data, start, end) {
    if (start > 0 || end < data.length) {
      // only create a substring if we really need to
      data = data.substring(start, end);
    }
    buffer.appendBinary(data);
  }
  
  module.exports = function (data, callback) {
    if (!process.browser) {
      var base64 = crypto.createHash('md5').update(data).digest('base64');
      callback(null, base64);
      return;
    }
    var inputIsString = typeof data === 'string';
    var len = inputIsString ? data.length : data.byteLength;
    var chunkSize = Math.min(MD5_CHUNK_SIZE, len);
    var chunks = Math.ceil(len / chunkSize);
    var currentChunk = 0;
    var buffer = inputIsString ? new Md5() : new Md5.ArrayBuffer();
  
    var append = inputIsString ? appendString : appendBuffer;
  
    function loadNextChunk() {
      var start = currentChunk * chunkSize;
      var end = start + chunkSize;
      currentChunk++;
      if (currentChunk < chunks) {
        append(buffer, data, start, end);
        setImmediateShim(loadNextChunk);
      } else {
        append(buffer, data, start, end);
        var raw = buffer.end(true);
        var base64 = rawToBase64(raw);
        callback(null, base64);
        buffer.destroy();
      }
    }
    loadNextChunk();
  };
  
  }).call(this,_dereq_(41),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"39":39,"41":41,"75":75}],22:[function(_dereq_,module,exports){
  'use strict';
  
  var errors = _dereq_(19);
  var uuid = _dereq_(28);
  
  function toObject(array) {
    return array.reduce(function (obj, item) {
      obj[item] = true;
      return obj;
    }, {});
  }
  // List of top level reserved words for doc
  var reservedWords = toObject([
    '_id',
    '_rev',
    '_attachments',
    '_deleted',
    '_revisions',
    '_revs_info',
    '_conflicts',
    '_deleted_conflicts',
    '_local_seq',
    '_rev_tree',
    //replication documents
    '_replication_id',
    '_replication_state',
    '_replication_state_time',
    '_replication_state_reason',
    '_replication_stats',
    // Specific to Couchbase Sync Gateway
    '_removed'
  ]);
  
  // List of reserved words that should end up the document
  var dataWords = toObject([
    '_attachments',
    //replication documents
    '_replication_id',
    '_replication_state',
    '_replication_state_time',
    '_replication_state_reason',
    '_replication_stats'
  ]);
  
  // Determine id an ID is valid
  //   - invalid IDs begin with an underescore that does not begin '_design' or
  //     '_local'
  //   - any other string value is a valid id
  // Returns the specific error object for each case
  exports.invalidIdError = function (id) {
    var err;
    if (!id) {
      err = errors.error(errors.MISSING_ID);
    } else if (typeof id !== 'string') {
      err = errors.error(errors.INVALID_ID);
    } else if (/^_/.test(id) && !(/^_(design|local)/).test(id)) {
      err = errors.error(errors.RESERVED_ID);
    }
    if (err) {
      throw err;
    }
  };
  
  function parseRevisionInfo(rev) {
    if (!/^\d+\-./.test(rev)) {
      return errors.error(errors.INVALID_REV);
    }
    var idx = rev.indexOf('-');
    var left = rev.substring(0, idx);
    var right = rev.substring(idx + 1);
    return {
      prefix: parseInt(left, 10),
      id: right
    };
  }
  
  function makeRevTreeFromRevisions(revisions, opts) {
    var pos = revisions.start - revisions.ids.length + 1;
  
    var revisionIds = revisions.ids;
    var ids = [revisionIds[0], opts, []];
  
    for (var i = 1, len = revisionIds.length; i < len; i++) {
      ids = [revisionIds[i], {status: 'missing'}, [ids]];
    }
  
    return [{
      pos: pos,
      ids: ids
    }];
  }
  
  // Preprocess documents, parse their revisions, assign an id and a
  // revision for new writes that are missing them, etc
  exports.parseDoc = function (doc, newEdits) {
  
    var nRevNum;
    var newRevId;
    var revInfo;
    var opts = {status: 'available'};
    if (doc._deleted) {
      opts.deleted = true;
    }
  
    if (newEdits) {
      if (!doc._id) {
        doc._id = uuid();
      }
      newRevId = uuid(32, 16).toLowerCase();
      if (doc._rev) {
        revInfo = parseRevisionInfo(doc._rev);
        if (revInfo.error) {
          return revInfo;
        }
        doc._rev_tree = [{
          pos: revInfo.prefix,
          ids: [revInfo.id, {status: 'missing'}, [[newRevId, opts, []]]]
        }];
        nRevNum = revInfo.prefix + 1;
      } else {
        doc._rev_tree = [{
          pos: 1,
          ids : [newRevId, opts, []]
        }];
        nRevNum = 1;
      }
    } else {
      if (doc._revisions) {
        doc._rev_tree = makeRevTreeFromRevisions(doc._revisions, opts);
        nRevNum = doc._revisions.start;
        newRevId = doc._revisions.ids[0];
      }
      if (!doc._rev_tree) {
        revInfo = parseRevisionInfo(doc._rev);
        if (revInfo.error) {
          return revInfo;
        }
        nRevNum = revInfo.prefix;
        newRevId = revInfo.id;
        doc._rev_tree = [{
          pos: nRevNum,
          ids: [newRevId, opts, []]
        }];
      }
    }
  
    exports.invalidIdError(doc._id);
  
    doc._rev = nRevNum + '-' + newRevId;
  
    var result = {metadata : {}, data : {}};
    for (var key in doc) {
      if (doc.hasOwnProperty(key)) {
        var specialKey = key[0] === '_';
        if (specialKey && !reservedWords[key]) {
          var error = errors.error(errors.DOC_VALIDATION, key);
          error.message = errors.DOC_VALIDATION.message + ': ' + key;
          throw error;
        } else if (specialKey && !dataWords[key]) {
          result.metadata[key.slice(1)] = doc[key];
        } else {
          result.data[key] = doc[key];
        }
      }
    }
    return result;
  };
  },{"19":19,"28":28}],23:[function(_dereq_,module,exports){
  'use strict';
  
  //
  // Parsing hex strings. Yeah.
  //
  // So basically we need this because of a bug in WebSQL:
  // https://code.google.com/p/chromium/issues/detail?id=422690
  // https://bugs.webkit.org/show_bug.cgi?id=137637
  //
  // UTF-8 and UTF-16 are provided as separate functions
  // for meager performance improvements
  //
  
  function decodeUtf8(str) {
    return decodeURIComponent(window.escape(str));
  }
  
  function hexToInt(charCode) {
    // '0'-'9' is 48-57
    // 'A'-'F' is 65-70
    // SQLite will only give us uppercase hex
    return charCode < 65 ? (charCode - 48) : (charCode - 55);
  }
  
  
  // Example:
  // pragma encoding=utf8;
  // select hex('A');
  // returns '41'
  function parseHexUtf8(str, start, end) {
    var result = '';
    while (start < end) {
      result += String.fromCharCode(
        (hexToInt(str.charCodeAt(start++)) << 4) |
          hexToInt(str.charCodeAt(start++)));
    }
    return result;
  }
  
  // Example:
  // pragma encoding=utf16;
  // select hex('A');
  // returns '4100'
  // notice that the 00 comes after the 41 (i.e. it's swizzled)
  function parseHexUtf16(str, start, end) {
    var result = '';
    while (start < end) {
      // UTF-16, so swizzle the bytes
      result += String.fromCharCode(
        (hexToInt(str.charCodeAt(start + 2)) << 12) |
          (hexToInt(str.charCodeAt(start + 3)) << 8) |
          (hexToInt(str.charCodeAt(start)) << 4) |
          hexToInt(str.charCodeAt(start + 1)));
      start += 4;
    }
    return result;
  }
  
  function parseHexString(str, encoding) {
    if (encoding === 'UTF-8') {
      return decodeUtf8(parseHexUtf8(str, 0, str.length));
    } else {
      return parseHexUtf16(str, 0, str.length);
    }
  }
  
  module.exports = parseHexString;
  },{}],24:[function(_dereq_,module,exports){
  'use strict';
  
  // originally parseUri 1.2.2, now patched by us
  // (c) Steven Levithan <stevenlevithan.com>
  // MIT License
  var options = {
    strictMode: false,
    key: ["source", "protocol", "authority", "userInfo", "user", "password",
      "host", "port", "relative", "path", "directory", "file", "query",
      "anchor"],
    q:   {
      name:   "queryKey",
      parser: /(?:^|&)([^&=]*)=?([^&]*)/g
    },
    parser: {
      /* jshint maxlen: false */
      strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
      loose:  /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/
    }
  };
  function parseUri(str) {
    var o = options;
    var m = o.parser[o.strictMode ? "strict" : "loose"].exec(str);
    var uri = {};
    var i = 14;
  
    while (i--) {
      var key = o.key[i];
      var value = m[i] || "";
      var encoded = ['user', 'password'].indexOf(key) !== -1;
      uri[key] = encoded ? decodeURIComponent(value) : value;
    }
  
    uri[o.q.name] = {};
    uri[o.key[12]].replace(o.q.parser, function ($0, $1, $2) {
      if ($1) {
        uri[o.q.name][$1] = $2;
      }
    });
  
    return uri;
  }
  
  
  module.exports = parseUri;
  },{}],25:[function(_dereq_,module,exports){
  'use strict';
  
  if (typeof Promise === 'function') {
    module.exports = Promise;
  } else {
    module.exports = _dereq_(49);
  }
  },{"49":49}],26:[function(_dereq_,module,exports){
  /* global fetch */
  /* global Headers */
  'use strict';
  
  var createBlob = _dereq_(17);
  var utils = _dereq_(36);
  
  function wrappedFetch() {
    var wrappedPromise = {};
  
    var promise = new utils.Promise(function(resolve, reject) {
      wrappedPromise.resolve = resolve;
      wrappedPromise.reject = reject;
    });
  
    var args = new Array(arguments.length);
  
    for (var i = 0; i < args.length; i++) {
      args[i] = arguments[i];
    }
  
    wrappedPromise.then = promise.then.bind(promise);
    wrappedPromise["catch"] = promise["catch"].bind(promise);
    wrappedPromise.promise = promise;
  
    fetch.apply(null, args).then(function(response) {
      wrappedPromise.resolve(response);
    }, function(error) {
      wrappedPromise.reject(error);
    })["catch"](function(error) {
      wrappedPromise["catch"](error);
    });
  
    return wrappedPromise;
  }
  
  function fetchRequest(options, callback) {
    var wrappedPromise, timer, fetchResponse;
  
    var headers = new Headers();
  
    var fetchOptions = {
      method: options.method,
      credentials: 'include',
      headers: headers
    };
  
    if (options.json) {
      headers.set('Accept', 'application/json');
      headers.set('Content-Type', options.headers['Content-Type'] ||
        'application/json');
    }
  
    if (options.body && (options.body instanceof Blob)) {
      utils.readAsBinaryString(options.body, function(binary) {
        fetchOptions.body = utils.fixBinary(binary);
      });
    } else if (options.body &&
               options.processData &&
               typeof options.body !== 'string') {
      fetchOptions.body = JSON.stringify(options.body);
    } else if ('body' in options) {
      fetchOptions.body = options.body;
    } else {
      fetchOptions.body = null;
    }
  
    Object.keys(options.headers).forEach(function(key) {
      if (options.headers.hasOwnProperty(key)) {
        headers.set(key, options.headers[key]);
      }
    });
  
    wrappedPromise = wrappedFetch(options.url, fetchOptions);
  
    if (options.timeout > 0) {
      timer = setTimeout(function() {
        wrappedPromise.reject(new Error('Load timeout for resource: ' +
          options.url));
      }, options.timeout);
    }
  
    wrappedPromise.promise.then(function(response) {
      var result;
  
      fetchResponse = response;
  
      if (options.timeout > 0) {
        clearTimeout(timer);
      }
  
      if (response.status >= 200 && response.status < 300) {
        return options.binary ? response.blob() : response.text();
      }
  
      return result.json();
    }).then(function(result) {
      if (fetchResponse.status >= 200 && fetchResponse.status < 300) {
        callback(null, fetchResponse, result);
      } else {
        callback(result, fetchResponse);
      }
    })["catch"](function(error) {
      callback(error, fetchResponse);
    });
  
    return {abort: wrappedPromise.reject};
  }
  
  function xhRequest(options, callback) {
  
    var xhr, timer, hasUpload;
  
    var abortReq = function () {
      xhr.abort();
    };
  
    if (options.xhr) {
      xhr = new options.xhr();
    } else {
      xhr = new XMLHttpRequest();
    }
  
    // cache-buster, specifically designed to work around IE's aggressive caching
    // see http://www.dashbay.com/2011/05/internet-explorer-caches-ajax/
    if (options.method === 'GET' && !options.cache) {
      var hasArgs = options.url.indexOf('?') !== -1;
      options.url += (hasArgs ? '&' : '?') + '_nonce=' + Date.now();
    }
  
    xhr.open(options.method, options.url);
    xhr.withCredentials = true;
  
    if (options.method === 'GET') {
      delete options.headers['Content-Type'];
    } else if (options.json) {
      options.headers.Accept = 'application/json';
      options.headers['Content-Type'] = options.headers['Content-Type'] ||
        'application/json';
      if (options.body &&
          options.processData &&
          typeof options.body !== "string") {
        options.body = JSON.stringify(options.body);
      }
    }
  
    if (options.binary) {
      xhr.responseType = 'arraybuffer';
    }
  
    if (!('body' in options)) {
      options.body = null;
    }
  
    for (var key in options.headers) {
      if (options.headers.hasOwnProperty(key)) {
        xhr.setRequestHeader(key, options.headers[key]);
      }
    }
  
    if (options.timeout > 0) {
      timer = setTimeout(abortReq, options.timeout);
      xhr.onprogress = function () {
        clearTimeout(timer);
        timer = setTimeout(abortReq, options.timeout);
      };
      if (typeof hasUpload === 'undefined') {
        // IE throws an error if you try to access it directly
        hasUpload = Object.keys(xhr).indexOf('upload') !== -1 &&
                    typeof xhr.upload !== 'undefined';
      }
      if (hasUpload) { // does not exist in ie9
        xhr.upload.onprogress = xhr.onprogress;
      }
    }
  
    xhr.onreadystatechange = function () {
      if (xhr.readyState !== 4) {
        return;
      }
  
      var response = {
        statusCode: xhr.status
      };
  
      if (xhr.status >= 200 && xhr.status < 300) {
        var data;
        if (options.binary) {
          data = createBlob([xhr.response || ''], {
            type: xhr.getResponseHeader('Content-Type')
          });
        } else {
          data = xhr.responseText;
        }
        callback(null, response, data);
      } else {
        var err = {};
        try {
          err = JSON.parse(xhr.response);
        } catch(e) {}
        callback(err, response);
      }
    };
  
    if (options.body && (options.body instanceof Blob)) {
      utils.readAsBinaryString(options.body, function (binary) {
        xhr.send(utils.fixBinary(binary));
      });
    } else {
      xhr.send(options.body);
    }
  
    return {abort: abortReq};
  }
  
  module.exports = function(options, callback) {
    if (typeof XMLHttpRequest === 'undefined' && !options.xhr) {
      return fetchRequest(options, callback);
    } else {
      return xhRequest(options, callback);
    }
  };
  
  },{"17":17,"36":36}],27:[function(_dereq_,module,exports){
  'use strict';
  
  var upsert = _dereq_(74).upsert;
  
  module.exports = function (db, doc, diffFun, cb) {
    return upsert.call(db, doc, diffFun, cb);
  };
  
  },{"74":74}],28:[function(_dereq_,module,exports){
  "use strict";
  
  // BEGIN Math.uuid.js
  
  /*!
  Math.uuid.js (v1.4)
  http://www.broofa.com
  mailto:robert@broofa.com
  
  Copyright (c) 2010 Robert Kieffer
  Dual licensed under the MIT and GPL licenses.
  */
  
  /*
   * Generate a random uuid.
   *
   * USAGE: Math.uuid(length, radix)
   *   length - the desired number of characters
   *   radix  - the number of allowable values for each character.
   *
   * EXAMPLES:
   *   // No arguments  - returns RFC4122, version 4 ID
   *   >>> Math.uuid()
   *   "92329D39-6F5C-4520-ABFC-AAB64544E172"
   *
   *   // One argument - returns ID of the specified length
   *   >>> Math.uuid(15)     // 15 character ID (default base=62)
   *   "VcydxgltxrVZSTV"
   *
   *   // Two arguments - returns ID of the specified length, and radix. 
   *   // (Radix must be <= 62)
   *   >>> Math.uuid(8, 2)  // 8 character ID (base=2)
   *   "01001010"
   *   >>> Math.uuid(8, 10) // 8 character ID (base=10)
   *   "47473046"
   *   >>> Math.uuid(8, 16) // 8 character ID (base=16)
   *   "098F4D35"
   */
  var chars = (
    '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ' +
    'abcdefghijklmnopqrstuvwxyz'
  ).split('');
  function getValue(radix) {
    return 0 | Math.random() * radix;
  }
  function uuid(len, radix) {
    radix = radix || chars.length;
    var out = '';
    var i = -1;
  
    if (len) {
      // Compact form
      while (++i < len) {
        out += chars[getValue(radix)];
      }
      return out;
    }
      // rfc4122, version 4 form
      // Fill in random data.  At i==19 set the high bits of clock sequence as
      // per rfc4122, sec. 4.1.5
    while (++i < 36) {
      switch (i) {
        case 8:
        case 13:
        case 18:
        case 23:
          out += '-';
          break;
        case 19:
          out += chars[(getValue(16) & 0x3) | 0x8];
          break;
        default:
          out += chars[getValue(16)];
      }
    }
  
    return out;
  }
  
  
  
  module.exports = uuid;
  
  
  },{}],29:[function(_dereq_,module,exports){
  'use strict';
  
  module.exports = evalFilter;
  function evalFilter(input) {
    /*jshint evil: true */
    return eval([
      '(function () { return ',
      input,
      ' })()'
    ].join(''));
  }
  },{}],30:[function(_dereq_,module,exports){
  'use strict';
  
  module.exports = evalView;
  function evalView(input) {
    /*jshint evil: true */
    return eval([
      '(function () {',
      '  return function (doc) {',
      '    var emitted = false;',
      '    var emit = function (a, b) {',
      '      emitted = true;',
      '    };',
      '    var view = ' + input + ';',
      '    view(doc);',
      '    if (emitted) {',
      '      return true;',
      '    }',
      '  }',
      '})()'
    ].join('\n'));
  }
  },{}],31:[function(_dereq_,module,exports){
  'use strict';
  var extend = _dereq_(67);
  
  
  // for a better overview of what this is doing, read:
  // https://github.com/apache/couchdb/blob/master/src/couchdb/couch_key_tree.erl
  //
  // But for a quick intro, CouchDB uses a revision tree to store a documents
  // history, A -> B -> C, when a document has conflicts, that is a branch in the
  // tree, A -> (B1 | B2 -> C), We store these as a nested array in the format
  //
  // KeyTree = [Path ... ]
  // Path = {pos: position_from_root, ids: Tree}
  // Tree = [Key, Opts, [Tree, ...]], in particular single node: [Key, []]
  
  // classic binary search
  function binarySearch(arr, item, comparator) {
    var low = 0;
    var high = arr.length;
    var mid;
    while (low < high) {
      mid = (low + high) >>> 1;
      if (comparator(arr[mid], item) < 0) {
        low = mid + 1;
      } else {
        high = mid;
      }
    }
    return low;
  }
  
  // assuming the arr is sorted, insert the item in the proper place
  function insertSorted(arr, item, comparator) {
    var idx = binarySearch(arr, item, comparator);
    arr.splice(idx, 0, item);
  }
  
  // Turn a path as a flat array into a tree with a single branch
  function pathToTree(path) {
    var doc = path.shift();
    var root = [doc.id, doc.opts, []];
    var leaf = root;
    var nleaf;
  
    while (path.length) {
      doc = path.shift();
      nleaf = [doc.id, doc.opts, []];
      leaf[2].push(nleaf);
      leaf = nleaf;
    }
    return root;
  }
  
  // compare the IDs of two trees
  function compareTree(a, b) {
    return a[0] < b[0] ? -1 : 1;
  }
  
  // Merge two trees together
  // The roots of tree1 and tree2 must be the same revision
  function mergeTree(in_tree1, in_tree2) {
    var queue = [{tree1: in_tree1, tree2: in_tree2}];
    var conflicts = false;
    while (queue.length > 0) {
      var item = queue.pop();
      var tree1 = item.tree1;
      var tree2 = item.tree2;
  
      if (tree1[1].status || tree2[1].status) {
        tree1[1].status =
          (tree1[1].status ===  'available' ||
           tree2[1].status === 'available') ? 'available' : 'missing';
      }
  
      for (var i = 0; i < tree2[2].length; i++) {
        if (!tree1[2][0]) {
          conflicts = 'new_leaf';
          tree1[2][0] = tree2[2][i];
          continue;
        }
  
        var merged = false;
        for (var j = 0; j < tree1[2].length; j++) {
          if (tree1[2][j][0] === tree2[2][i][0]) {
            queue.push({tree1: tree1[2][j], tree2: tree2[2][i]});
            merged = true;
          }
        }
        if (!merged) {
          conflicts = 'new_branch';
          insertSorted(tree1[2], tree2[2][i], compareTree);
        }
      }
    }
    return {conflicts: conflicts, tree: in_tree1};
  }
  
  function doMerge(tree, path, dontExpand) {
    var restree = [];
    var conflicts = false;
    var merged = false;
    var res;
  
    if (!tree.length) {
      return {tree: [path], conflicts: 'new_leaf'};
    }
  
    tree.forEach(function (branch) {
      if (branch.pos === path.pos && branch.ids[0] === path.ids[0]) {
        // Paths start at the same position and have the same root, so they need
        // merged
        res = mergeTree(branch.ids, path.ids);
        restree.push({pos: branch.pos, ids: res.tree});
        conflicts = conflicts || res.conflicts;
        merged = true;
      } else if (dontExpand !== true) {
        // The paths start at a different position, take the earliest path and
        // traverse up until it as at the same point from root as the path we
        // want to merge.  If the keys match we return the longer path with the
        // other merged After stemming we dont want to expand the trees
  
        var t1 = branch.pos < path.pos ? branch : path;
        var t2 = branch.pos < path.pos ? path : branch;
        var diff = t2.pos - t1.pos;
  
        var candidateParents = [];
  
        var trees = [];
        trees.push({ids: t1.ids, diff: diff, parent: null, parentIdx: null});
        while (trees.length > 0) {
          var item = trees.pop();
          if (item.diff === 0) {
            if (item.ids[0] === t2.ids[0]) {
              candidateParents.push(item);
            }
            continue;
          }
          if (!item.ids) {
            continue;
          }
          /*jshint loopfunc:true */
          item.ids[2].forEach(function (el, idx) {
            trees.push(
              {ids: el, diff: item.diff - 1, parent: item.ids, parentIdx: idx});
          });
        }
  
        var el = candidateParents[0];
  
        if (!el) {
          restree.push(branch);
        } else {
          res = mergeTree(el.ids, t2.ids);
          el.parent[2][el.parentIdx] = res.tree;
          restree.push({pos: t1.pos, ids: t1.ids});
          conflicts = conflicts || res.conflicts;
          merged = true;
        }
      } else {
        restree.push(branch);
      }
    });
  
    // We didnt find
    if (!merged) {
      restree.push(path);
    }
  
    restree.sort(function (a, b) {
      return a.pos - b.pos;
    });
  
    return {
      tree: restree,
      conflicts: conflicts || 'internal_node'
    };
  }
  
  // To ensure we dont grow the revision tree infinitely, we stem old revisions
  function stem(tree, depth) {
    // First we break out the tree into a complete list of root to leaf paths,
    // we cut off the start of the path and generate a new set of flat trees
    var stemmedPaths = PouchMerge.rootToLeaf(tree).map(function (path) {
      var stemmed = path.ids.slice(-depth);
      return {
        pos: path.pos + (path.ids.length - stemmed.length),
        ids: pathToTree(stemmed)
      };
    });
    // Then we remerge all those flat trees together, ensuring that we dont
    // connect trees that would go beyond the depth limit
    return stemmedPaths.reduce(function (prev, current) {
      return doMerge(prev, current, true).tree;
    }, [stemmedPaths.shift()]);
  }
  
  var PouchMerge = {};
  
  PouchMerge.merge = function (tree, path, depth) {
    // Ugh, nicer way to not modify arguments in place?
    tree = extend(true, [], tree);
    path = extend(true, {}, path);
    var newTree = doMerge(tree, path);
    return {
      tree: stem(newTree.tree, depth),
      conflicts: newTree.conflicts
    };
  };
  
  // We fetch all leafs of the revision tree, and sort them based on tree length
  // and whether they were deleted, undeleted documents with the longest revision
  // tree (most edits) win
  // The final sort algorithm is slightly documented in a sidebar here:
  // http://guide.couchdb.org/draft/conflicts.html
  PouchMerge.winningRev = function (metadata) {
    var leafs = [];
    PouchMerge.traverseRevTree(metadata.rev_tree,
                                function (isLeaf, pos, id, something, opts) {
      if (isLeaf) {
        leafs.push({pos: pos, id: id, deleted: !!opts.deleted});
      }
    });
    leafs.sort(function (a, b) {
      if (a.deleted !== b.deleted) {
        return a.deleted > b.deleted ? 1 : -1;
      }
      if (a.pos !== b.pos) {
        return b.pos - a.pos;
      }
      return a.id < b.id ? 1 : -1;
    });
  
    return leafs[0].pos + '-' + leafs[0].id;
  };
  
  // Pretty much all below can be combined into a higher order function to
  // traverse revisions
  // The return value from the callback will be passed as context to all
  // children of that node
  PouchMerge.traverseRevTree = function (revs, callback) {
    var toVisit = revs.slice();
  
    var node;
    while ((node = toVisit.pop())) {
      var pos = node.pos;
      var tree = node.ids;
      var branches = tree[2];
      var newCtx =
        callback(branches.length === 0, pos, tree[0], node.ctx, tree[1]);
      for (var i = 0, len = branches.length; i < len; i++) {
        toVisit.push({pos: pos + 1, ids: branches[i], ctx: newCtx});
      }
    }
  };
  
  PouchMerge.collectLeaves = function (revs) {
    var leaves = [];
    PouchMerge.traverseRevTree(revs, function (isLeaf, pos, id, acc, opts) {
      if (isLeaf) {
        leaves.push({rev: pos + "-" + id, pos: pos, opts: opts});
      }
    });
    leaves.sort(function (a, b) {
      return b.pos - a.pos;
    });
    leaves.forEach(function (leaf) { delete leaf.pos; });
    return leaves;
  };
  
  // returns revs of all conflicts that is leaves such that
  // 1. are not deleted and
  // 2. are different than winning revision
  PouchMerge.collectConflicts = function (metadata) {
    var win = PouchMerge.winningRev(metadata);
    var leaves = PouchMerge.collectLeaves(metadata.rev_tree);
    var conflicts = [];
    leaves.forEach(function (leaf) {
      if (leaf.rev !== win && !leaf.opts.deleted) {
        conflicts.push(leaf.rev);
      }
    });
    return conflicts;
  };
  
  PouchMerge.rootToLeaf = function (tree) {
    var paths = [];
    PouchMerge.traverseRevTree(tree, function (isLeaf, pos, id, history, opts) {
      history = history ? history.slice(0) : [];
      history.push({id: id, opts: opts});
      if (isLeaf) {
        var rootPos = pos + 1 - history.length;
        paths.unshift({pos: rootPos, ids: history});
      }
      return history;
    });
    return paths;
  };
  
  
  module.exports = PouchMerge;
  
  },{"67":67}],32:[function(_dereq_,module,exports){
  'use strict';
  
  var utils = _dereq_(36);
  var EE = _dereq_(40).EventEmitter;
  var Checkpointer = _dereq_(14);
  
  var MAX_SIMULTANEOUS_REVS = 50;
  var RETRY_DEFAULT = false;
  
  function randomNumber(min, max) {
    min = parseInt(min, 10);
    max = parseInt(max, 10);
    if (min !== min) {
      min = 0;
    }
    if (max !== max || max <= min) {
      max = (min || 1) << 1; //doubling
    } else {
      max = max + 1;
    }
    var ratio = Math.random();
    var range = max - min;
  
    return ~~(range * ratio + min); // ~~ coerces to an int, but fast.
  }
  
  function defaultBackOff(min) {
    var max = 0;
    if (!min) {
      max = 2000;
    }
    return randomNumber(min, max);
  }
  
  function backOff(repId, src, target, opts, returnValue, result, error) {
    if (opts.retry === false) {
      returnValue.emit('error', error);
      returnValue.removeAllListeners();
      return;
    }
    opts.default_back_off = opts.default_back_off || 0;
    opts.retries = opts.retries || 0;
    if (typeof opts.back_off_function !== 'function') {
      opts.back_off_function = defaultBackOff;
    }
    opts.retries++;
    if (opts.max_retries && opts.retries > opts.max_retries) {
      returnValue.emit('error', new Error('tried ' +
        opts.retries + ' times but replication failed'));
      returnValue.removeAllListeners();
      return;
    }
    returnValue.emit('requestError', error);
    if (returnValue.state === 'active') {
      returnValue.emit('paused', error);
      returnValue.state = 'stopped';
      returnValue.once('active', function () {
        opts.current_back_off = opts.default_back_off;
      });
    }
  
    opts.current_back_off = opts.current_back_off || opts.default_back_off;
    opts.current_back_off = opts.back_off_function(opts.current_back_off);
    setTimeout(function () {
      replicate(repId, src, target, opts, returnValue);
    }, opts.current_back_off);
  }
  
  // We create a basic promise so the caller can cancel the replication possibly
  // before we have actually started listening to changes etc
  utils.inherits(Replication, EE);
  function Replication() {
    EE.call(this);
    this.cancelled = false;
    this.state = 'pending';
    var self = this;
    var promise = new utils.Promise(function (fulfill, reject) {
      self.once('complete', fulfill);
      self.once('error', reject);
    });
    self.then = function (resolve, reject) {
      return promise.then(resolve, reject);
    };
    self["catch"] = function (reject) {
      return promise["catch"](reject);
    };
    // As we allow error handling via "error" event as well,
    // put a stub in here so that rejecting never throws UnhandledError.
    self["catch"](function () {});
  }
  
  Replication.prototype.cancel = function () {
    this.cancelled = true;
    this.state = 'cancelled';
    this.emit('cancel');
  };
  
  Replication.prototype.ready = function (src, target) {
    var self = this;
    function onDestroy() {
      self.cancel();
    }
    src.once('destroyed', onDestroy);
    target.once('destroyed', onDestroy);
    function cleanup() {
      src.removeListener('destroyed', onDestroy);
      target.removeListener('destroyed', onDestroy);
    }
    this.then(cleanup, cleanup);
  };
  
  
  // TODO: check CouchDB's replication id generation
  // Generate a unique id particular to this replication
  function genReplicationId(src, target, opts) {
    var filterFun = opts.filter ? opts.filter.toString() : '';
    return src.id().then(function (src_id) {
      return target.id().then(function (target_id) {
        var queryData = src_id + target_id + filterFun +
          JSON.stringify(opts.query_params) + opts.doc_ids;
        return utils.MD5(queryData).then(function (md5) {
          // can't use straight-up md5 alphabet, because
          // the char '/' is interpreted as being for attachments,
          // and + is also not url-safe
          md5 = md5.replace(/\//g, '.').replace(/\+/g, '_');
          return '_local/' + md5;
        });
      });
    });
  }
  
  function replicate(repId, src, target, opts, returnValue, result) {
    var batches = [];               // list of batches to be processed
    var currentBatch;               // the batch currently being processed
    var pendingBatch = {
      seq: 0,
      changes: [],
      docs: []
    }; // next batch, not yet ready to be processed
    var writingCheckpoint = false;  // true while checkpoint is being written
    var changesCompleted = false;   // true when all changes received
    var replicationCompleted = false; // true when replication has completed
    var last_seq = 0;
    var continuous = opts.continuous || opts.live || false;
    var batch_size = opts.batch_size || 100;
    var batches_limit = opts.batches_limit || 10;
    var changesPending = false;     // true while src.changes is running
    var doc_ids = opts.doc_ids;
    var state = {
      cancelled: false
    };
    var checkpointer = new Checkpointer(src, target, repId, state);
    var allErrors = [];
    var changedDocs = [];
  
    result = result || {
      ok: true,
      start_time: new Date(),
      docs_read: 0,
      docs_written: 0,
      doc_write_failures: 0,
      errors: []
    };
  
    var changesOpts = {};
    returnValue.ready(src, target);
  
    function writeDocs() {
      if (currentBatch.docs.length === 0) {
        return;
      }
      var docs = currentBatch.docs;
      return target.bulkDocs({docs: docs, new_edits: false}).then(function (res) {
        if (state.cancelled) {
          completeReplication();
          throw new Error('cancelled');
        }
        var errors = [];
        var errorsById = {};
        res.forEach(function (res) {
          if (res.error) {
            result.doc_write_failures++;
            errors.push(res);
            errorsById[res.id] = res;
          }
        });
        allErrors = allErrors.concat(errors);
        result.docs_written += currentBatch.docs.length - errors.length;
        var non403s = errors.filter(function (error) {
          return error.name !== 'unauthorized' && error.name !== 'forbidden';
        });
  
        changedDocs = [];
        docs.forEach(function(doc) {
          var error = errorsById[doc._id];
          if (error) {
            returnValue.emit('denied', utils.clone(error));
          } else {
            changedDocs.push(doc);
          }
        });
  
        if (non403s.length > 0) {
          var error = new Error('bulkDocs error');
          error.other_errors = errors;
          abortReplication('target.bulkDocs failed to write docs', error);
          throw new Error('bulkWrite partial failure');
        }
      }, function (err) {
        result.doc_write_failures += docs.length;
        throw err;
      });
    }
  
    function processDiffDoc(id) {
      var diffs = currentBatch.diffs;
      var allMissing = diffs[id].missing;
      // avoid url too long error by batching
      var missingBatches = [];
      for (var i = 0; i < allMissing.length; i += MAX_SIMULTANEOUS_REVS) {
        missingBatches.push(allMissing.slice(i, Math.min(allMissing.length,
          i + MAX_SIMULTANEOUS_REVS)));
      }
  
      return utils.Promise.all(missingBatches.map(function (missing) {
        var opts = {
          revs: true,
          open_revs: missing,
          attachments: true
        };
        return src.get(id, opts).then(function (docs) {
          docs.forEach(function (doc) {
            if (state.cancelled) {
              return completeReplication();
            }
            if (doc.ok) {
              result.docs_read++;
              currentBatch.pendingRevs++;
              currentBatch.docs.push(doc.ok);
            }
          });
          delete diffs[id];
        });
      }));
    }
  
    function getAllDocs() {
      var diffKeys = Object.keys(currentBatch.diffs);
      return utils.Promise.all(diffKeys.map(processDiffDoc));
    }
  
  
    function getRevisionOneDocs() {
      // filter out the generation 1 docs and get them
      // leaving the non-generation one docs to be got otherwise
      var ids = Object.keys(currentBatch.diffs).filter(function (id) {
        var missing = currentBatch.diffs[id].missing;
        return missing.length === 1 && missing[0].slice(0, 2) === '1-';
      });
      if (!ids.length) { // nothing to fetch
        return utils.Promise.resolve();
      }
      return src.allDocs({
        keys: ids,
        include_docs: true
      }).then(function (res) {
        if (state.cancelled) {
          completeReplication();
          throw (new Error('cancelled'));
        }
        res.rows.forEach(function (row) {
          if (row.doc && !row.deleted &&
            row.value.rev.slice(0, 2) === '1-' && (
              !row.doc._attachments ||
              Object.keys(row.doc._attachments).length === 0
            )
          ) {
            result.docs_read++;
            currentBatch.pendingRevs++;
            currentBatch.docs.push(row.doc);
            delete currentBatch.diffs[row.id];
          }
        });
      });
    }
  
    function getDocs() {
      return getRevisionOneDocs().then(getAllDocs);
    }
  
    function finishBatch() {
      writingCheckpoint = true;
      return checkpointer.writeCheckpoint(currentBatch.seq).then(function () {
        writingCheckpoint = false;
        if (state.cancelled) {
          completeReplication();
          throw new Error('cancelled');
        }
        result.last_seq = last_seq = currentBatch.seq;
        var outResult = utils.clone(result);
        outResult.docs = changedDocs;
        returnValue.emit('change', outResult);
        currentBatch = undefined;
        getChanges();
      })["catch"](function (err) {
        writingCheckpoint = false;
        abortReplication('writeCheckpoint completed with error', err);
        throw err;
      });
    }
  
    function getDiffs() {
      var diff = {};
      currentBatch.changes.forEach(function (change) {
        // Couchbase Sync Gateway emits these, but we can ignore them
        if (change.id === "_user/") {
          return;
        }
        diff[change.id] = change.changes.map(function (x) {
          return x.rev;
        });
      });
      return target.revsDiff(diff).then(function (diffs) {
        if (state.cancelled) {
          completeReplication();
          throw new Error('cancelled');
        }
        // currentBatch.diffs elements are deleted as the documents are written
        currentBatch.diffs = diffs;
        currentBatch.pendingRevs = 0;
      });
    }
  
    function startNextBatch() {
      if (state.cancelled || currentBatch) {
        return;
      }
      if (batches.length === 0) {
        processPendingBatch(true);
        return;
      }
      currentBatch = batches.shift();
      getDiffs()
        .then(getDocs)
        .then(writeDocs)
        .then(finishBatch)
        .then(startNextBatch)[
        "catch"](function (err) {
          abortReplication('batch processing terminated with error', err);
        });
    }
  
  
    function processPendingBatch(immediate) {
      if (pendingBatch.changes.length === 0) {
        if (batches.length === 0 && !currentBatch) {
          if ((continuous && changesOpts.live) || changesCompleted) {
            returnValue.state = 'pending';
            returnValue.emit('paused');
            returnValue.emit('uptodate', result);
          }
          if (changesCompleted) {
            completeReplication();
          }
        }
        return;
      }
      if (
        immediate ||
        changesCompleted ||
        pendingBatch.changes.length >= batch_size
      ) {
        batches.push(pendingBatch);
        pendingBatch = {
          seq: 0,
          changes: [],
          docs: []
        };
        if (returnValue.state === 'pending' || returnValue.state === 'stopped') {
          returnValue.state = 'active';
          returnValue.emit('active');
        }
        startNextBatch();
      }
    }
  
  
    function abortReplication(reason, err) {
      if (replicationCompleted) {
        return;
      }
      if (!err.message) {
        err.message = reason;
      }
      result.ok = false;
      result.status = 'aborting';
      result.errors.push(err);
      allErrors = allErrors.concat(err);
      batches = [];
      pendingBatch = {
        seq: 0,
        changes: [],
        docs: []
      };
      completeReplication();
    }
  
  
    function completeReplication() {
      if (replicationCompleted) {
        return;
      }
      if (state.cancelled) {
        result.status = 'cancelled';
        if (writingCheckpoint) {
          return;
        }
      }
      result.status = result.status || 'complete';
      result.end_time = new Date();
      result.last_seq = last_seq;
      replicationCompleted = state.cancelled = true;
      var non403s = allErrors.filter(function (error) {
        return error.name !== 'unauthorized' && error.name !== 'forbidden';
      });
      if (non403s.length > 0) {
        var error = allErrors.pop();
        if (allErrors.length > 0) {
          error.other_errors = allErrors;
        }
        error.result = result;
        backOff(repId, src, target, opts, returnValue, result, error);
      } else {
        result.errors = allErrors;
        returnValue.emit('complete', result);
        returnValue.removeAllListeners();
      }
    }
  
  
    function onChange(change) {
      if (state.cancelled) {
        return completeReplication();
      }
      var filter = utils.filterChange(opts)(change);
      if (!filter) {
        return;
      }
      if (
        pendingBatch.changes.length === 0 &&
        batches.length === 0 &&
        !currentBatch
      ) {
        returnValue.emit('outofdate', result);
      }
      pendingBatch.seq = change.seq;
      pendingBatch.changes.push(change);
      processPendingBatch(batches.length === 0);
    }
  
  
    function onChangesComplete(changes) {
      changesPending = false;
      if (state.cancelled) {
        return completeReplication();
      }
  
      // if no results were returned then we're done,
      // else fetch more
      if (changes.results.length > 0) {
        changesOpts.since = changes.last_seq;
        getChanges();
      } else {
        if (continuous) {
          changesOpts.live = true;
          getChanges();
        } else {
          changesCompleted = true;
        }
      }
      processPendingBatch(true);
    }
  
  
    function onChangesError(err) {
      changesPending = false;
      if (state.cancelled) {
        return completeReplication();
      }
      abortReplication('changes rejected', err);
    }
  
  
    function getChanges() {
      if (!(
        !changesPending &&
        !changesCompleted &&
        batches.length < batches_limit
      )) {
        return;
      }
      changesPending = true;
      function abortChanges() {
        changes.cancel();
      }
      function removeListener() {
        returnValue.removeListener('cancel', abortChanges);
      }
      returnValue.once('cancel', abortChanges);
      var changes = src.changes(changesOpts)
      .on('change', onChange);
      changes.then(removeListener, removeListener);
      changes.then(onChangesComplete)[
      "catch"](onChangesError);
    }
  
  
    function startChanges() {
      checkpointer.getCheckpoint().then(function (checkpoint) {
        last_seq = checkpoint;
        changesOpts = {
          since: last_seq,
          limit: batch_size,
          batch_size: batch_size,
          style: 'all_docs',
          doc_ids: doc_ids,
          returnDocs: true // required so we know when we're done
        };
        if (opts.filter) {
          if (typeof opts.filter !== 'string') {
            // required for the client-side filter in onChange
            changesOpts.include_docs = true;
          } else { // ddoc filter
            changesOpts.filter = opts.filter;
          }
        }
        if (opts.query_params) {
          changesOpts.query_params = opts.query_params;
        }
        if (opts.view) {
          changesOpts.view = opts.view;
        }
        getChanges();
      })["catch"](function (err) {
        abortReplication('getCheckpoint rejected with ', err);
      });
    }
  
    if (returnValue.cancelled) { // cancelled immediately
      completeReplication();
      return;
    }
  
    returnValue.once('cancel', completeReplication);
  
    if (typeof opts.onChange === 'function') {
      returnValue.on('change', opts.onChange);
    }
  
    if (typeof opts.complete === 'function') {
      returnValue.once('error', opts.complete);
      returnValue.once('complete', function (result) {
        opts.complete(null, result);
      });
    }
  
    if (typeof opts.since === 'undefined') {
      startChanges();
    } else {
      writingCheckpoint = true;
      checkpointer.writeCheckpoint(opts.since).then(function () {
        writingCheckpoint = false;
        if (state.cancelled) {
          completeReplication();
          return;
        }
        last_seq = opts.since;
        startChanges();
      })["catch"](function (err) {
        writingCheckpoint = false;
        abortReplication('writeCheckpoint completed with error', err);
        throw err;
      });
    }
  }
  
  exports.toPouch = toPouch;
  function toPouch(db, opts) {
    var PouchConstructor = opts.PouchConstructor;
    if (typeof db === 'string') {
      return new PouchConstructor(db, opts);
    } else if (db.then) {
      return db;
    } else {
      return utils.Promise.resolve(db);
    }
  }
  
  
  exports.replicate = replicateWrapper;
  function replicateWrapper(src, target, opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    if (typeof opts === 'undefined') {
      opts = {};
    }
    if (!opts.complete) {
      opts.complete = callback || function () {};
    }
    opts = utils.clone(opts);
    opts.continuous = opts.continuous || opts.live;
    opts.retry = ('retry' in opts) ? opts.retry : RETRY_DEFAULT;
    /*jshint validthis:true */
    opts.PouchConstructor = opts.PouchConstructor || this;
    var replicateRet = new Replication(opts);
    toPouch(src, opts).then(function (src) {
      return toPouch(target, opts).then(function (target) {
        return genReplicationId(src, target, opts).then(function (repId) {
          replicate(repId, src, target, opts, replicateRet);
        });
      });
    })["catch"](function (err) {
      replicateRet.emit('error', err);
      opts.complete(err);
    });
    return replicateRet;
  }
  
  },{"14":14,"36":36,"40":40}],33:[function(_dereq_,module,exports){
  "use strict";
  
  var PouchDB = _dereq_(15);
  var utils = _dereq_(36);
  var EventEmitter = _dereq_(40).EventEmitter;
  PouchDB.adapters = {};
  PouchDB.preferredAdapters = [];
  
  PouchDB.prefix = '_pouch_';
  
  var eventEmitter = new EventEmitter();
  
  var eventEmitterMethods = [
    'on',
    'addListener',
    'emit',
    'listeners',
    'once',
    'removeAllListeners',
    'removeListener',
    'setMaxListeners'
  ];
  
  eventEmitterMethods.forEach(function (method) {
    PouchDB[method] = eventEmitter[method].bind(eventEmitter);
  });
  PouchDB.setMaxListeners(0);
  PouchDB.parseAdapter = function (name, opts) {
    var match = name.match(/([a-z\-]*):\/\/(.*)/);
    var adapter, adapterName;
    if (match) {
      // the http adapter expects the fully qualified name
      name = /http(s?)/.test(match[1]) ? match[1] + '://' + match[2] : match[2];
      adapter = match[1];
      if (!PouchDB.adapters[adapter].valid()) {
        throw 'Invalid adapter';
      }
      return {name: name, adapter: match[1]};
    }
  
    // check for browsers that have been upgraded from websql-only to websql+idb
    var skipIdb = 'idb' in PouchDB.adapters && 'websql' in PouchDB.adapters &&
      utils.hasLocalStorage() &&
      localStorage['_pouch__websqldb_' + PouchDB.prefix + name];
  
  
    if (opts.adapter) {
      adapterName = opts.adapter;
    } else if (typeof opts !== 'undefined' && opts.db) {
      adapterName = 'leveldb';
    } else { // automatically determine adapter
      for (var i = 0; i < PouchDB.preferredAdapters.length; ++i) {
        adapterName = PouchDB.preferredAdapters[i];
        if (adapterName in PouchDB.adapters) {
          if (skipIdb && adapterName === 'idb') {
            // log it, because this can be confusing during development
            console.log('PouchDB is downgrading "' + name + '" to WebSQL to' +
              ' avoid data loss, because it was already opened with WebSQL.');
            continue; // keep using websql to avoid user data loss
          }
          break;
        }
      }
    }
  
    adapter = PouchDB.adapters[adapterName];
  
    // if adapter is invalid, then an error will be thrown later
    var usePrefix = (adapter && 'use_prefix' in adapter) ?
        adapter.use_prefix : true;
  
    return {
      name: usePrefix ? (PouchDB.prefix + name) : name,
      adapter: adapterName
    };
  };
  
  PouchDB.destroy = utils.toPromise(function (name, opts, callback) {
    console.log('PouchDB.destroy() is deprecated and will be removed. ' +
                'Please use db.destroy() instead.');
  
    if (typeof opts === 'function' || typeof opts === 'undefined') {
      callback = opts;
      opts = {};
    }
    if (name && typeof name === 'object') {
      opts = name;
      name = undefined;
    }
  
    new PouchDB(name, opts, function (err, db) {
      if (err) {
        return callback(err);
      }
      db.destroy(callback);
    });
  });
  
  PouchDB.adapter = function (id, obj, addToPreferredAdapters) {
    if (obj.valid()) {
      PouchDB.adapters[id] = obj;
      if (addToPreferredAdapters) {
        PouchDB.preferredAdapters.push(id);
      }
    }
  };
  
  PouchDB.plugin = function (obj) {
    Object.keys(obj).forEach(function (id) {
      PouchDB.prototype[id] = obj[id];
    });
  };
  
  PouchDB.defaults = function (defaultOpts) {
    function PouchAlt(name, opts, callback) {
      if (typeof opts === 'function' || typeof opts === 'undefined') {
        callback = opts;
        opts = {};
      }
      if (name && typeof name === 'object') {
        opts = name;
        name = undefined;
      }
  
      opts = utils.extend(true, {}, defaultOpts, opts);
      PouchDB.call(this, name, opts, callback);
    }
  
    utils.inherits(PouchAlt, PouchDB);
  
    PouchAlt.destroy = utils.toPromise(function (name, opts, callback) {
      if (typeof opts === 'function' || typeof opts === 'undefined') {
        callback = opts;
        opts = {};
      }
  
      if (name && typeof name === 'object') {
        opts = name;
        name = undefined;
      }
      opts = utils.extend(true, {}, defaultOpts, opts);
      return PouchDB.destroy(name, opts, callback);
    });
  
    eventEmitterMethods.forEach(function (method) {
      PouchAlt[method] = eventEmitter[method].bind(eventEmitter);
    });
    PouchAlt.setMaxListeners(0);
  
    PouchAlt.preferredAdapters = PouchDB.preferredAdapters.slice();
    Object.keys(PouchDB).forEach(function (key) {
      if (!(key in PouchAlt)) {
        PouchAlt[key] = PouchDB[key];
      }
    });
  
    return PouchAlt;
  };
  
  module.exports = PouchDB;
  
  },{"15":15,"36":36,"40":40}],34:[function(_dereq_,module,exports){
  'use strict';
  
  var utils = _dereq_(36);
  var replication = _dereq_(32);
  var replicate = replication.replicate;
  var EE = _dereq_(40).EventEmitter;
  
  utils.inherits(Sync, EE);
  module.exports = sync;
  function sync(src, target, opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    if (typeof opts === 'undefined') {
      opts = {};
    }
    opts = utils.clone(opts);
    /*jshint validthis:true */
    opts.PouchConstructor = opts.PouchConstructor || this;
    src = replication.toPouch(src, opts);
    target = replication.toPouch(target, opts);
    return new Sync(src, target, opts, callback);
  }
  
  function Sync(src, target, opts, callback) {
    var self = this;
    this.canceled = false;
  
    var onChange, complete;
    if ('onChange' in opts) {
      onChange = opts.onChange;
      delete opts.onChange;
    }
    if (typeof callback === 'function' && !opts.complete) {
      complete = callback;
    } else if ('complete' in opts) {
      complete = opts.complete;
      delete opts.complete;
    }
  
    this.push = replicate(src, target, opts);
    this.pull = replicate(target, src, opts);
  
    var emittedCancel = false;
    function onCancel(data) {
      if (!emittedCancel) {
        emittedCancel = true;
        self.emit('cancel', data);
      }
    }
    function pullChange(change) {
      self.emit('change', {
        direction: 'pull',
        change: change
      });
    }
    function pushChange(change) {
      self.emit('change', {
        direction: 'push',
        change: change
      });
    }
    function pushDenied(doc) {
      self.emit('denied', {
        direction: 'push',
        doc: doc
      });
    }
    function pullDenied(doc) {
      self.emit('denied', {
        direction: 'pull',
        doc: doc
      });
    }
  
    var listeners = {};
    var removed = {};
  
    function removeAll(type) { // type is 'push' or 'pull'
      return function (event, func) {
        var isChange = event === 'change' &&
          (func === pullChange || func === pushChange);
        var isCancel = event === 'cancel' && func === onCancel;
        var isOtherEvent = event in listeners && func === listeners[event];
  
        if (isChange || isCancel || isOtherEvent) {
          if (!(event in removed)) {
            removed[event] = {};
          }
          removed[event][type] = true;
          if (Object.keys(removed[event]).length === 2) {
            // both push and pull have asked to be removed
            self.removeAllListeners(event);
          }
        }
      };
    }
  
    if (opts.live) {
      this.push.on('complete', self.pull.cancel.bind(self.pull));
      this.pull.on('complete', self.push.cancel.bind(self.push));
    }
  
    this.on('newListener', function (event) {
      if (event === 'change') {
        self.pull.on('change', pullChange);
        self.push.on('change', pushChange);
      } else if (event === 'denied') {
        self.pull.on('denied', pullDenied);
        self.push.on('denied', pushDenied);
      } else if (event === 'cancel') {
        self.pull.on('cancel', onCancel);
        self.push.on('cancel', onCancel);
      } else if (event !== 'error' &&
        event !== 'removeListener' &&
        event !== 'complete' && !(event in listeners)) {
        listeners[event] = function (e) {
          self.emit(event, e);
        };
        self.pull.on(event, listeners[event]);
        self.push.on(event, listeners[event]);
      }
    });
  
    this.on('removeListener', function (event) {
      if (event === 'change') {
        self.pull.removeListener('change', pullChange);
        self.push.removeListener('change', pushChange);
      } else if (event === 'cancel') {
        self.pull.removeListener('cancel', onCancel);
        self.push.removeListener('cancel', onCancel);
      } else if (event in listeners) {
        if (typeof listeners[event] === 'function') {
          self.pull.removeListener(event, listeners[event]);
          self.push.removeListener(event, listeners[event]);
          delete listeners[event];
        }
      }
    });
  
    this.pull.on('removeListener', removeAll('pull'));
    this.push.on('removeListener', removeAll('push'));
  
    var promise = utils.Promise.all([
      this.push,
      this.pull
    ]).then(function (resp) {
      var out = {
        push: resp[0],
        pull: resp[1]
      };
      self.emit('complete', out);
      if (complete) {
        complete(null, out);
      }
      self.removeAllListeners();
      return out;
    }, function (err) {
      self.cancel();
      self.emit('error', err);
      if (complete) {
        complete(err);
      }
      self.removeAllListeners();
      throw err;
    });
  
    this.then = function (success, err) {
      return promise.then(success, err);
    };
  
    this["catch"] = function (err) {
      return promise["catch"](err);
    };
  }
  
  Sync.prototype.cancel = function () {
    if (!this.canceled) {
      this.canceled = true;
      this.push.cancel();
      this.pull.cancel();
    }
  };
  
  },{"32":32,"36":36,"40":40}],35:[function(_dereq_,module,exports){
  'use strict';
  
  module.exports = TaskQueue;
  
  function TaskQueue() {
    this.isReady = false;
    this.failed = false;
    this.queue = [];
  }
  
  TaskQueue.prototype.execute = function () {
    var d, func;
    if (this.failed) {
      while ((d = this.queue.shift())) {
        if (typeof d === 'function') {
          d(this.failed);
          continue;
        }
        func = d.parameters[d.parameters.length - 1];
        if (typeof func === 'function') {
          func(this.failed);
        } else if (d.name === 'changes' && typeof func.complete === 'function') {
          func.complete(this.failed);
        }
      }
    } else if (this.isReady) {
      while ((d = this.queue.shift())) {
  
        if (typeof d === 'function') {
          d();
        } else {
          d.task = this.db[d.name].apply(this.db, d.parameters);
        }
      }
    }
  };
  
  TaskQueue.prototype.fail = function (err) {
    this.failed = err;
    this.execute();
  };
  
  TaskQueue.prototype.ready = function (db) {
    if (this.failed) {
      return false;
    } else if (arguments.length === 0) {
      return this.isReady;
    }
    this.isReady = db ? true: false;
    this.db = db;
    this.execute();
  };
  
  TaskQueue.prototype.addTask = function (name, parameters) {
    if (typeof name === 'function') {
      this.queue.push(name);
      if (this.failed) {
        this.execute();
      }
    } else {
      var task = { name: name, parameters: parameters };
      this.queue.push(task);
      if (this.failed) {
        this.execute();
      }
      return task;
    }
  };
  
  },{}],36:[function(_dereq_,module,exports){
  (function (process){
  /*jshint strict: false */
  /*global chrome */
  var merge = _dereq_(31);
  exports.extend = _dereq_(67);
  exports.ajax = _dereq_(16);
  exports.createBlob = _dereq_(17);
  exports.uuid = _dereq_(28);
  exports.getArguments = _dereq_(38);
  var buffer = _dereq_(18);
  var errors = _dereq_(19);
  var EventEmitter = _dereq_(40).EventEmitter;
  var collections = _dereq_(66);
  exports.Map = collections.Map;
  exports.Set = collections.Set;
  var parseDoc = _dereq_(22);
  
  var Promise = _dereq_(25);
  exports.Promise = Promise;
  
  exports.lastIndexOf = function (str, char) {
    for (var i = str.length - 1; i >= 0; i--) {
      if (str.charAt(i) === char) {
        return i;
      }
    }
    return -1;
  };
  
  exports.clone = function (obj) {
    return exports.extend(true, {}, obj);
  };
  
  // like underscore/lodash _.pick()
  exports.pick = function (obj, arr) {
    var res = {};
    for (var i = 0, len = arr.length; i < len; i++) {
      var prop = arr[i];
      res[prop] = obj[prop];
    }
    return res;
  };
  
  exports.inherits = _dereq_(45);
  
  function isChromeApp() {
    return (typeof chrome !== "undefined" &&
            typeof chrome.storage !== "undefined" &&
            typeof chrome.storage.local !== "undefined");
  }
  
  // Pretty dumb name for a function, just wraps callback calls so we dont
  // to if (callback) callback() everywhere
  exports.call = exports.getArguments(function (args) {
    if (!args.length) {
      return;
    }
    var fun = args.shift();
    if (typeof fun === 'function') {
      fun.apply(this, args);
    }
  });
  
  exports.isLocalId = function (id) {
    return (/^_local/).test(id);
  };
  
  // check if a specific revision of a doc has been deleted
  //  - metadata: the metadata object from the doc store
  //  - rev: (optional) the revision to check. defaults to winning revision
  exports.isDeleted = function (metadata, rev) {
    if (!rev) {
      rev = merge.winningRev(metadata);
    }
    var dashIndex = rev.indexOf('-');
    if (dashIndex !== -1) {
      rev = rev.substring(dashIndex + 1);
    }
    var deleted = false;
    merge.traverseRevTree(metadata.rev_tree,
    function (isLeaf, pos, id, acc, opts) {
      if (id === rev) {
        deleted = !!opts.deleted;
      }
    });
  
    return deleted;
  };
  
  exports.revExists = function (metadata, rev) {
    var found = false;
    merge.traverseRevTree(metadata.rev_tree, function (leaf, pos, id) {
      if ((pos + '-' + id) === rev) {
        found = true;
      }
    });
    return found;
  };
  
  exports.filterChange = function filterChange(opts) {
    var req = {};
    var hasFilter = opts.filter && typeof opts.filter === 'function';
    req.query = opts.query_params;
  
    return function filter(change) {
      if (!change.doc) {
        // CSG sends events on the changes feed that don't have documents,
        // this hack makes a whole lot of existing code robust.
        change.doc = {};
      }
      if (opts.filter && hasFilter && !opts.filter.call(this, change.doc, req)) {
        return false;
      }
      if (!opts.include_docs) {
        delete change.doc;
      } else if (!opts.attachments) {
        for (var att in change.doc._attachments) {
          if (change.doc._attachments.hasOwnProperty(att)) {
            change.doc._attachments[att].stub = true;
          }
        }
      }
      return true;
    };
  };
  
  exports.parseDoc = parseDoc.parseDoc;
  exports.invalidIdError = parseDoc.invalidIdError;
  
  exports.isCordova = function () {
    return (typeof cordova !== "undefined" ||
            typeof PhoneGap !== "undefined" ||
            typeof phonegap !== "undefined");
  };
  
  exports.hasLocalStorage = function () {
    if (isChromeApp()) {
      return false;
    }
    try {
      return localStorage;
    } catch (e) {
      return false;
    }
  };
  exports.Changes = Changes;
  exports.inherits(Changes, EventEmitter);
  function Changes() {
    if (!(this instanceof Changes)) {
      return new Changes();
    }
    var self = this;
    EventEmitter.call(this);
    this.isChrome = isChromeApp();
    this.listeners = {};
    this.hasLocal = false;
    if (!this.isChrome) {
      this.hasLocal = exports.hasLocalStorage();
    }
    if (this.isChrome) {
      chrome.storage.onChanged.addListener(function (e) {
        // make sure it's event addressed to us
        if (e.db_name != null) {
          //object only has oldValue, newValue members
          self.emit(e.dbName.newValue);
        }
      });
    } else if (this.hasLocal) {
      if (typeof addEventListener !== 'undefined') {
        addEventListener("storage", function (e) {
          self.emit(e.key);
        });
      } else { // old IE
        window.attachEvent("storage", function (e) {
          self.emit(e.key);
        });
      }
    }
  
  }
  Changes.prototype.addListener = function (dbName, id, db, opts) {
    if (this.listeners[id]) {
      return;
    }
    var self = this;
    var inprogress = false;
    function eventFunction() {
      if (!self.listeners[id]) {
        return;
      }
      if (inprogress) {
        inprogress = 'waiting';
        return;
      }
      inprogress = true;
      db.changes({
        style: opts.style,
        include_docs: opts.include_docs,
        attachments: opts.attachments,
        conflicts: opts.conflicts,
        continuous: false,
        descending: false,
        filter: opts.filter,
        doc_ids: opts.doc_ids,
        view: opts.view,
        since: opts.since,
        query_params: opts.query_params
      }).on('change', function (c) {
        if (c.seq > opts.since && !opts.cancelled) {
          opts.since = c.seq;
          exports.call(opts.onChange, c);
        }
      }).on('complete', function () {
        if (inprogress === 'waiting') {
          process.nextTick(function () {
            self.notify(dbName);
          });
        }
        inprogress = false;
      }).on('error', function () {
        inprogress = false;
      });
    }
    this.listeners[id] = eventFunction;
    this.on(dbName, eventFunction);
  };
  
  Changes.prototype.removeListener = function (dbName, id) {
    if (!(id in this.listeners)) {
      return;
    }
    EventEmitter.prototype.removeListener.call(this, dbName,
      this.listeners[id]);
  };
  
  
  Changes.prototype.notifyLocalWindows = function (dbName) {
    //do a useless change on a storage thing
    //in order to get other windows's listeners to activate
    if (this.isChrome) {
      chrome.storage.local.set({dbName: dbName});
    } else if (this.hasLocal) {
      localStorage[dbName] = (localStorage[dbName] === "a") ? "b" : "a";
    }
  };
  
  Changes.prototype.notify = function (dbName) {
    this.emit(dbName);
    this.notifyLocalWindows(dbName);
  };
  
  if (typeof atob === 'function') {
    exports.atob = function (str) {
      return atob(str);
    };
  } else {
    exports.atob = function (str) {
      var base64 = new buffer(str, 'base64');
      // Node.js will just skip the characters it can't encode instead of
      // throwing and exception
      if (base64.toString('base64') !== str) {
        throw ("Cannot base64 encode full string");
      }
      return base64.toString('binary');
    };
  }
  
  if (typeof btoa === 'function') {
    exports.btoa = function (str) {
      return btoa(str);
    };
  } else {
    exports.btoa = function (str) {
      return new buffer(str, 'binary').toString('base64');
    };
  }
  
  // From http://stackoverflow.com/questions/14967647/ (continues on next line)
  // encode-decode-image-with-base64-breaks-image (2013-04-21)
  exports.fixBinary = function (bin) {
    if (!process.browser) {
      // don't need to do this in Node
      return bin;
    }
  
    var length = bin.length;
    var buf = new ArrayBuffer(length);
    var arr = new Uint8Array(buf);
    for (var i = 0; i < length; i++) {
      arr[i] = bin.charCodeAt(i);
    }
    return buf;
  };
  
  // shim for browsers that don't support it
  exports.readAsBinaryString = function (blob, callback) {
    var reader = new FileReader();
    var hasBinaryString = typeof reader.readAsBinaryString === 'function';
    reader.onloadend = function (e) {
      var result = e.target.result || '';
      if (hasBinaryString) {
        return callback(result);
      }
      callback(exports.arrayBufferToBinaryString(result));
    };
    if (hasBinaryString) {
      reader.readAsBinaryString(blob);
    } else {
      reader.readAsArrayBuffer(blob);
    }
  };
  
  // simplified API. universal browser support is assumed
  exports.readAsArrayBuffer = function (blob, callback) {
    var reader = new FileReader();
    reader.onloadend = function (e) {
      var result = e.target.result || new ArrayBuffer(0);
      callback(result);
    };
    reader.readAsArrayBuffer(blob);
  };
  
  exports.once = function (fun) {
    var called = false;
    return exports.getArguments(function (args) {
      if (called) {
        throw new Error('once called  more than once');
      } else {
        called = true;
        fun.apply(this, args);
      }
    });
  };
  
  exports.toPromise = function (func) {
    //create the function we will be returning
    return exports.getArguments(function (args) {
      var self = this;
      var tempCB =
        (typeof args[args.length - 1] === 'function') ? args.pop() : false;
      // if the last argument is a function, assume its a callback
      var usedCB;
      if (tempCB) {
        // if it was a callback, create a new callback which calls it,
        // but do so async so we don't trap any errors
        usedCB = function (err, resp) {
          process.nextTick(function () {
            tempCB(err, resp);
          });
        };
      }
      var promise = new Promise(function (fulfill, reject) {
        var resp;
        try {
          var callback = exports.once(function (err, mesg) {
            if (err) {
              reject(err);
            } else {
              fulfill(mesg);
            }
          });
          // create a callback for this invocation
          // apply the function in the orig context
          args.push(callback);
          resp = func.apply(self, args);
          if (resp && typeof resp.then === 'function') {
            fulfill(resp);
          }
        } catch (e) {
          reject(e);
        }
      });
      // if there is a callback, call it back
      if (usedCB) {
        promise.then(function (result) {
          usedCB(null, result);
        }, usedCB);
      }
      promise.cancel = function () {
        return this;
      };
      return promise;
    });
  };
  
  exports.adapterFun = function (name, callback) {
    var log = _dereq_(42)('pouchdb:api');
  
    function logApiCall(self, name, args) {
      if (!log.enabled) {
        return;
      }
      var logArgs = [self._db_name, name];
      for (var i = 0; i < args.length - 1; i++) {
        logArgs.push(args[i]);
      }
      log.apply(null, logArgs);
  
      // override the callback itself to log the response
      var origCallback = args[args.length - 1];
      args[args.length - 1] = function (err, res) {
        var responseArgs = [self._db_name, name];
        responseArgs = responseArgs.concat(
          err ? ['error', err] : ['success', res]
        );
        log.apply(null, responseArgs);
        origCallback(err, res);
      };
    }
  
  
    return exports.toPromise(exports.getArguments(function (args) {
      if (this._closed) {
        return Promise.reject(new Error('database is closed'));
      }
      var self = this;
      logApiCall(self, name, args);
      if (!this.taskqueue.isReady) {
        return new Promise(function (fulfill, reject) {
          self.taskqueue.addTask(function (failed) {
            if (failed) {
              reject(failed);
            } else {
              fulfill(self[name].apply(self, args));
            }
          });
        });
      }
      return callback.apply(this, args);
    }));
  };
  
  //Can't find original post, but this is close
  //http://stackoverflow.com/questions/6965107/ (continues on next line)
  //converting-between-strings-and-arraybuffers
  exports.arrayBufferToBinaryString = function (buffer) {
    var binary = "";
    var bytes = new Uint8Array(buffer);
    var length = bytes.byteLength;
    for (var i = 0; i < length; i++) {
      binary += String.fromCharCode(bytes[i]);
    }
    return binary;
  };
  
  exports.cancellableFun = function (fun, self, opts) {
  
    opts = opts ? exports.clone(true, {}, opts) : {};
  
    var emitter = new EventEmitter();
    var oldComplete = opts.complete || function () { };
    var complete = opts.complete = exports.once(function (err, resp) {
      if (err) {
        oldComplete(err);
      } else {
        emitter.emit('end', resp);
        oldComplete(null, resp);
      }
      emitter.removeAllListeners();
    });
    var oldOnChange = opts.onChange || function () {};
    var lastChange = 0;
    self.on('destroyed', function () {
      emitter.removeAllListeners();
    });
    opts.onChange = function (change) {
      oldOnChange(change);
      if (change.seq <= lastChange) {
        return;
      }
      lastChange = change.seq;
      emitter.emit('change', change);
      if (change.deleted) {
        emitter.emit('delete', change);
      } else if (change.changes.length === 1 &&
        change.changes[0].rev.slice(0, 1) === '1-') {
        emitter.emit('create', change);
      } else {
        emitter.emit('update', change);
      }
    };
    var promise = new Promise(function (fulfill, reject) {
      opts.complete = function (err, res) {
        if (err) {
          reject(err);
        } else {
          fulfill(res);
        }
      };
    });
  
    promise.then(function (result) {
      complete(null, result);
    }, complete);
  
    // this needs to be overwridden by caller, dont fire complete until
    // the task is ready
    promise.cancel = function () {
      promise.isCancelled = true;
      if (self.taskqueue.isReady) {
        opts.complete(null, {status: 'cancelled'});
      }
    };
  
    if (!self.taskqueue.isReady) {
      self.taskqueue.addTask(function () {
        if (promise.isCancelled) {
          opts.complete(null, {status: 'cancelled'});
        } else {
          fun(self, opts, promise);
        }
      });
    } else {
      fun(self, opts, promise);
    }
    promise.on = emitter.on.bind(emitter);
    promise.once = emitter.once.bind(emitter);
    promise.addListener = emitter.addListener.bind(emitter);
    promise.removeListener = emitter.removeListener.bind(emitter);
    promise.removeAllListeners = emitter.removeAllListeners.bind(emitter);
    promise.setMaxListeners = emitter.setMaxListeners.bind(emitter);
    promise.listeners = emitter.listeners.bind(emitter);
    promise.emit = emitter.emit.bind(emitter);
    return promise;
  };
  
  exports.MD5 = exports.toPromise(_dereq_(21));
  
  exports.explain404 = _dereq_(20);
  
  exports.info = function (str) {
    if (typeof console !== 'undefined' && 'info' in console) {
      console.info(str);
    }
  };
  
  exports.parseUri = _dereq_(24);
  
  exports.compare = function (left, right) {
    return left < right ? -1 : left > right ? 1 : 0;
  };
  
  exports.updateDoc = function updateDoc(prev, docInfo, results,
                                         i, cb, writeDoc, newEdits) {
  
    if (exports.revExists(prev, docInfo.metadata.rev)) {
      results[i] = docInfo;
      return cb();
    }
  
    // TODO: some of these can be pre-calculated, but it's safer to just
    // call merge.winningRev() and exports.isDeleted() all over again
    var previousWinningRev = merge.winningRev(prev);
    var previouslyDeleted = exports.isDeleted(prev, previousWinningRev);
    var deleted = exports.isDeleted(docInfo.metadata);
    var isRoot = /^1-/.test(docInfo.metadata.rev);
  
    if (previouslyDeleted && !deleted && newEdits && isRoot) {
      var newDoc = docInfo.data;
      newDoc._rev = previousWinningRev;
      newDoc._id = docInfo.metadata.id;
      docInfo = exports.parseDoc(newDoc, newEdits);
    }
  
    var merged = merge.merge(prev.rev_tree, docInfo.metadata.rev_tree[0], 1000);
  
    var inConflict = newEdits && (((previouslyDeleted && deleted) ||
      (!previouslyDeleted && merged.conflicts !== 'new_leaf') ||
      (previouslyDeleted && !deleted && merged.conflicts === 'new_branch')));
  
    if (inConflict) {
      var err = errors.error(errors.REV_CONFLICT);
      results[i] = err;
      return cb();
    }
  
    var newRev = docInfo.metadata.rev;
    docInfo.metadata.rev_tree = merged.tree;
    if (prev.rev_map) {
      docInfo.metadata.rev_map = prev.rev_map; // used by leveldb
    }
  
    // recalculate
    var winningRev = merge.winningRev(docInfo.metadata);
    var winningRevIsDeleted = exports.isDeleted(docInfo.metadata, winningRev);
  
    // calculate the total number of documents that were added/removed,
    // from the perspective of total_rows/doc_count
    var delta = (previouslyDeleted === winningRevIsDeleted) ? 0 :
        previouslyDeleted < winningRevIsDeleted ? -1 : 1;
  
    var newRevIsDeleted = exports.isDeleted(docInfo.metadata, newRev);
  
    writeDoc(docInfo, winningRev, winningRevIsDeleted, newRevIsDeleted,
      true, delta, i, cb);
  };
  
  exports.processDocs = function processDocs(docInfos, api, fetchedDocs,
                                             tx, results, writeDoc, opts,
                                             overallCallback) {
  
    if (!docInfos.length) {
      return;
    }
  
    function insertDoc(docInfo, resultsIdx, callback) {
      // Cant insert new deleted documents
      var winningRev = merge.winningRev(docInfo.metadata);
      var deleted = exports.isDeleted(docInfo.metadata, winningRev);
      if ('was_delete' in opts && deleted) {
        results[resultsIdx] = errors.error(errors.MISSING_DOC, 'deleted');
        return callback();
      }
  
      var delta = deleted ? 0 : 1;
  
      writeDoc(docInfo, winningRev, deleted, deleted, false,
        delta, resultsIdx, callback);
    }
  
    var newEdits = opts.new_edits;
    var idsToDocs = new exports.Map();
  
    var docsDone = 0;
    var docsToDo = docInfos.length;
  
    function checkAllDocsDone() {
      if (++docsDone === docsToDo && overallCallback) {
        overallCallback();
      }
    }
  
    docInfos.forEach(function (currentDoc, resultsIdx) {
  
      if (currentDoc._id && exports.isLocalId(currentDoc._id)) {
        api[currentDoc._deleted ? '_removeLocal' : '_putLocal'](
          currentDoc, {ctx: tx}, function (err) {
            if (err) {
              results[resultsIdx] = err;
            } else {
              results[resultsIdx] = {ok: true};
            }
            checkAllDocsDone();
          });
        return;
      }
  
      var id = currentDoc.metadata.id;
      if (idsToDocs.has(id)) {
        docsToDo--; // duplicate
        idsToDocs.get(id).push([currentDoc, resultsIdx]);
      } else {
        idsToDocs.set(id, [[currentDoc, resultsIdx]]);
      }
    });
  
    // in the case of new_edits, the user can provide multiple docs
    // with the same id. these need to be processed sequentially
    idsToDocs.forEach(function (docs, id) {
      var numDone = 0;
  
      function docWritten() {
        if (++numDone < docs.length) {
          nextDoc();
        } else {
          checkAllDocsDone();
        }
      }
      function nextDoc() {
        var value = docs[numDone];
        var currentDoc = value[0];
        var resultsIdx = value[1];
  
        if (fetchedDocs.has(id)) {
          exports.updateDoc(fetchedDocs.get(id), currentDoc, results,
            resultsIdx, docWritten, writeDoc, newEdits);
        } else {
          insertDoc(currentDoc, resultsIdx, docWritten);
        }
      }
      nextDoc();
    });
  };
  
  exports.preprocessAttachments = function preprocessAttachments(
      docInfos, blobType, callback) {
  
    if (!docInfos.length) {
      return callback();
    }
  
    var docv = 0;
  
    function parseBase64(data) {
      try {
        return exports.atob(data);
      } catch (e) {
        var err = errors.error(errors.BAD_ARG,
                               'Attachments need to be base64 encoded');
        return {error: err};
      }
    }
  
    function preprocessAttachment(att, callback) {
      if (att.stub) {
        return callback();
      }
      if (typeof att.data === 'string') {
        // input is a base64 string
  
        var asBinary = parseBase64(att.data);
        if (asBinary.error) {
          return callback(asBinary.error);
        }
  
        att.length = asBinary.length;
        if (blobType === 'blob') {
          att.data = exports.createBlob([exports.fixBinary(asBinary)],
            {type: att.content_type});
        } else if (blobType === 'base64') {
          att.data = exports.btoa(asBinary);
        } else { // binary
          att.data = asBinary;
        }
        exports.MD5(asBinary).then(function (result) {
          att.digest = 'md5-' + result;
          callback();
        });
      } else { // input is a blob
        exports.readAsArrayBuffer(att.data, function (buff) {
          if (blobType === 'binary') {
            att.data = exports.arrayBufferToBinaryString(buff);
          } else if (blobType === 'base64') {
            att.data = exports.btoa(exports.arrayBufferToBinaryString(buff));
          }
          exports.MD5(buff).then(function (result) {
            att.digest = 'md5-' + result;
            att.length = buff.byteLength;
            callback();
          });
        });
      }
    }
  
    var overallErr;
  
    docInfos.forEach(function (docInfo) {
      var attachments = docInfo.data && docInfo.data._attachments ?
        Object.keys(docInfo.data._attachments) : [];
      var recv = 0;
  
      if (!attachments.length) {
        return done();
      }
  
      function processedAttachment(err) {
        overallErr = err;
        recv++;
        if (recv === attachments.length) {
          done();
        }
      }
  
      for (var key in docInfo.data._attachments) {
        if (docInfo.data._attachments.hasOwnProperty(key)) {
          preprocessAttachment(docInfo.data._attachments[key],
            processedAttachment);
        }
      }
    });
  
    function done() {
      docv++;
      if (docInfos.length === docv) {
        if (overallErr) {
          callback(overallErr);
        } else {
          callback();
        }
      }
    }
  };
  
  // compact a tree by marking its non-leafs as missing,
  // and return a list of revs to delete
  exports.compactTree = function compactTree(metadata) {
    var revs = [];
    merge.traverseRevTree(metadata.rev_tree, function (isLeaf, pos,
                                                       revHash, ctx, opts) {
      if (opts.status === 'available' && !isLeaf) {
        revs.push(pos + '-' + revHash);
        opts.status = 'missing';
      }
    });
    return revs;
  };
  
  var vuvuzela = _dereq_(76);
  
  exports.safeJsonParse = function safeJsonParse(str) {
    try {
      return JSON.parse(str);
    } catch (e) {
      return vuvuzela.parse(str);
    }
  };
  
  exports.safeJsonStringify = function safeJsonStringify(json) {
    try {
      return JSON.stringify(json);
    } catch (e) {
      return vuvuzela.stringify(json);
    }
  };
  
  }).call(this,_dereq_(41))
  },{"16":16,"17":17,"18":18,"19":19,"20":20,"21":21,"22":22,"24":24,"25":25,"28":28,"31":31,"38":38,"40":40,"41":41,"42":42,"45":45,"66":66,"67":67,"76":76}],37:[function(_dereq_,module,exports){
  module.exports = "3.5.0";
  
  },{}],38:[function(_dereq_,module,exports){
  'use strict';
  
  module.exports = argsArray;
  
  function argsArray(fun) {
    return function () {
      var len = arguments.length;
      if (len) {
        var args = [];
        var i = -1;
        while (++i < len) {
          args[i] = arguments[i];
        }
        return fun.call(this, args);
      } else {
        return fun.call(this, []);
      }
    };
  }
  },{}],39:[function(_dereq_,module,exports){
  
  },{}],40:[function(_dereq_,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  function EventEmitter() {
    this._events = this._events || {};
    this._maxListeners = this._maxListeners || undefined;
  }
  module.exports = EventEmitter;
  
  // Backwards-compat with node 0.10.x
  EventEmitter.EventEmitter = EventEmitter;
  
  EventEmitter.prototype._events = undefined;
  EventEmitter.prototype._maxListeners = undefined;
  
  // By default EventEmitters will print a warning if more than 10 listeners are
  // added to it. This is a useful default which helps finding memory leaks.
  EventEmitter.defaultMaxListeners = 10;
  
  // Obviously not all Emitters should be limited to 10. This function allows
  // that to be increased. Set to zero for unlimited.
  EventEmitter.prototype.setMaxListeners = function(n) {
    if (!isNumber(n) || n < 0 || isNaN(n))
      throw TypeError('n must be a positive number');
    this._maxListeners = n;
    return this;
  };
  
  EventEmitter.prototype.emit = function(type) {
    var er, handler, len, args, i, listeners;
  
    if (!this._events)
      this._events = {};
  
    // If there is no 'error' event listener then throw.
    if (type === 'error') {
      if (!this._events.error ||
          (isObject(this._events.error) && !this._events.error.length)) {
        er = arguments[1];
        if (er instanceof Error) {
          throw er; // Unhandled 'error' event
        }
        throw TypeError('Uncaught, unspecified "error" event.');
      }
    }
  
    handler = this._events[type];
  
    if (isUndefined(handler))
      return false;
  
    if (isFunction(handler)) {
      switch (arguments.length) {
        // fast cases
        case 1:
          handler.call(this);
          break;
        case 2:
          handler.call(this, arguments[1]);
          break;
        case 3:
          handler.call(this, arguments[1], arguments[2]);
          break;
        // slower
        default:
          len = arguments.length;
          args = new Array(len - 1);
          for (i = 1; i < len; i++)
            args[i - 1] = arguments[i];
          handler.apply(this, args);
      }
    } else if (isObject(handler)) {
      len = arguments.length;
      args = new Array(len - 1);
      for (i = 1; i < len; i++)
        args[i - 1] = arguments[i];
  
      listeners = handler.slice();
      len = listeners.length;
      for (i = 0; i < len; i++)
        listeners[i].apply(this, args);
    }
  
    return true;
  };
  
  EventEmitter.prototype.addListener = function(type, listener) {
    var m;
  
    if (!isFunction(listener))
      throw TypeError('listener must be a function');
  
    if (!this._events)
      this._events = {};
  
    // To avoid recursion in the case that type === "newListener"! Before
    // adding it to the listeners, first emit "newListener".
    if (this._events.newListener)
      this.emit('newListener', type,
                isFunction(listener.listener) ?
                listener.listener : listener);
  
    if (!this._events[type])
      // Optimize the case of one listener. Don't need the extra array object.
      this._events[type] = listener;
    else if (isObject(this._events[type]))
      // If we've already got an array, just append.
      this._events[type].push(listener);
    else
      // Adding the second element, need to change to array.
      this._events[type] = [this._events[type], listener];
  
    // Check for listener leak
    if (isObject(this._events[type]) && !this._events[type].warned) {
      var m;
      if (!isUndefined(this._maxListeners)) {
        m = this._maxListeners;
      } else {
        m = EventEmitter.defaultMaxListeners;
      }
  
      if (m && m > 0 && this._events[type].length > m) {
        this._events[type].warned = true;
        console.error('(node) warning: possible EventEmitter memory ' +
                      'leak detected. %d listeners added. ' +
                      'Use emitter.setMaxListeners() to increase limit.',
                      this._events[type].length);
        if (typeof console.trace === 'function') {
          // not supported in IE 10
          console.trace();
        }
      }
    }
  
    return this;
  };
  
  EventEmitter.prototype.on = EventEmitter.prototype.addListener;
  
  EventEmitter.prototype.once = function(type, listener) {
    if (!isFunction(listener))
      throw TypeError('listener must be a function');
  
    var fired = false;
  
    function g() {
      this.removeListener(type, g);
  
      if (!fired) {
        fired = true;
        listener.apply(this, arguments);
      }
    }
  
    g.listener = listener;
    this.on(type, g);
  
    return this;
  };
  
  // emits a 'removeListener' event iff the listener was removed
  EventEmitter.prototype.removeListener = function(type, listener) {
    var list, position, length, i;
  
    if (!isFunction(listener))
      throw TypeError('listener must be a function');
  
    if (!this._events || !this._events[type])
      return this;
  
    list = this._events[type];
    length = list.length;
    position = -1;
  
    if (list === listener ||
        (isFunction(list.listener) && list.listener === listener)) {
      delete this._events[type];
      if (this._events.removeListener)
        this.emit('removeListener', type, listener);
  
    } else if (isObject(list)) {
      for (i = length; i-- > 0;) {
        if (list[i] === listener ||
            (list[i].listener && list[i].listener === listener)) {
          position = i;
          break;
        }
      }
  
      if (position < 0)
        return this;
  
      if (list.length === 1) {
        list.length = 0;
        delete this._events[type];
      } else {
        list.splice(position, 1);
      }
  
      if (this._events.removeListener)
        this.emit('removeListener', type, listener);
    }
  
    return this;
  };
  
  EventEmitter.prototype.removeAllListeners = function(type) {
    var key, listeners;
  
    if (!this._events)
      return this;
  
    // not listening for removeListener, no need to emit
    if (!this._events.removeListener) {
      if (arguments.length === 0)
        this._events = {};
      else if (this._events[type])
        delete this._events[type];
      return this;
    }
  
    // emit removeListener for all listeners on all events
    if (arguments.length === 0) {
      for (key in this._events) {
        if (key === 'removeListener') continue;
        this.removeAllListeners(key);
      }
      this.removeAllListeners('removeListener');
      this._events = {};
      return this;
    }
  
    listeners = this._events[type];
  
    if (isFunction(listeners)) {
      this.removeListener(type, listeners);
    } else {
      // LIFO order
      while (listeners.length)
        this.removeListener(type, listeners[listeners.length - 1]);
    }
    delete this._events[type];
  
    return this;
  };
  
  EventEmitter.prototype.listeners = function(type) {
    var ret;
    if (!this._events || !this._events[type])
      ret = [];
    else if (isFunction(this._events[type]))
      ret = [this._events[type]];
    else
      ret = this._events[type].slice();
    return ret;
  };
  
  EventEmitter.listenerCount = function(emitter, type) {
    var ret;
    if (!emitter._events || !emitter._events[type])
      ret = 0;
    else if (isFunction(emitter._events[type]))
      ret = 1;
    else
      ret = emitter._events[type].length;
    return ret;
  };
  
  function isFunction(arg) {
    return typeof arg === 'function';
  }
  
  function isNumber(arg) {
    return typeof arg === 'number';
  }
  
  function isObject(arg) {
    return typeof arg === 'object' && arg !== null;
  }
  
  function isUndefined(arg) {
    return arg === void 0;
  }
  
  },{}],41:[function(_dereq_,module,exports){
  // shim for using process in browser
  
  var process = module.exports = {};
  var queue = [];
  var draining = false;
  
  function drainQueue() {
      if (draining) {
          return;
      }
      draining = true;
      var currentQueue;
      var len = queue.length;
      while(len) {
          currentQueue = queue;
          queue = [];
          var i = -1;
          while (++i < len) {
              currentQueue[i]();
          }
          len = queue.length;
      }
      draining = false;
  }
  process.nextTick = function (fun) {
      queue.push(fun);
      if (!draining) {
          setTimeout(drainQueue, 0);
      }
  };
  
  process.title = 'browser';
  process.browser = true;
  process.env = {};
  process.argv = [];
  process.version = ''; // empty string to avoid regexp issues
  process.versions = {};
  
  function noop() {}
  
  process.on = noop;
  process.addListener = noop;
  process.once = noop;
  process.off = noop;
  process.removeListener = noop;
  process.removeAllListeners = noop;
  process.emit = noop;
  
  process.binding = function (name) {
      throw new Error('process.binding is not supported');
  };
  
  // TODO(shtylman)
  process.cwd = function () { return '/' };
  process.chdir = function (dir) {
      throw new Error('process.chdir is not supported');
  };
  process.umask = function() { return 0; };
  
  },{}],42:[function(_dereq_,module,exports){
  
  /**
   * This is the web browser implementation of `debug()`.
   *
   * Expose `debug()` as the module.
   */
  
  exports = module.exports = _dereq_(43);
  exports.log = log;
  exports.formatArgs = formatArgs;
  exports.save = save;
  exports.load = load;
  exports.useColors = useColors;
  
  /**
   * Use chrome.storage.local if we are in an app
   */
  
  var storage;
  
  if (typeof chrome !== 'undefined' && typeof chrome.storage !== 'undefined')
    storage = chrome.storage.local;
  else
    storage = localstorage();
  
  /**
   * Colors.
   */
  
  exports.colors = [
    'lightseagreen',
    'forestgreen',
    'goldenrod',
    'dodgerblue',
    'darkorchid',
    'crimson'
  ];
  
  /**
   * Currently only WebKit-based Web Inspectors, Firefox >= v31,
   * and the Firebug extension (any Firefox version) are known
   * to support "%c" CSS customizations.
   *
   * TODO: add a `localStorage` variable to explicitly enable/disable colors
   */
  
  function useColors() {
    // is webkit? http://stackoverflow.com/a/16459606/376773
    return ('WebkitAppearance' in document.documentElement.style) ||
      // is firebug? http://stackoverflow.com/a/398120/376773
      (window.console && (console.firebug || (console.exception && console.table))) ||
      // is firefox >= v31?
      // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
      (navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31);
  }
  
  /**
   * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
   */
  
  exports.formatters.j = function(v) {
    return JSON.stringify(v);
  };
  
  
  /**
   * Colorize log arguments if enabled.
   *
   * @api public
   */
  
  function formatArgs() {
    var args = arguments;
    var useColors = this.useColors;
  
    args[0] = (useColors ? '%c' : '')
      + this.namespace
      + (useColors ? ' %c' : ' ')
      + args[0]
      + (useColors ? '%c ' : ' ')
      + '+' + exports.humanize(this.diff);
  
    if (!useColors) return args;
  
    var c = 'color: ' + this.color;
    args = [args[0], c, 'color: inherit'].concat(Array.prototype.slice.call(args, 1));
  
    // the final "%c" is somewhat tricky, because there could be other
    // arguments passed either before or after the %c, so we need to
    // figure out the correct index to insert the CSS into
    var index = 0;
    var lastC = 0;
    args[0].replace(/%[a-z%]/g, function(match) {
      if ('%' === match) return;
      index++;
      if ('%c' === match) {
        // we only are interested in the *last* %c
        // (the user may have provided their own)
        lastC = index;
      }
    });
  
    args.splice(lastC, 0, c);
    return args;
  }
  
  /**
   * Invokes `console.log()` when available.
   * No-op when `console.log` is not a "function".
   *
   * @api public
   */
  
  function log() {
    // this hackery is required for IE8/9, where
    // the `console.log` function doesn't have 'apply'
    return 'object' === typeof console
      && console.log
      && Function.prototype.apply.call(console.log, console, arguments);
  }
  
  /**
   * Save `namespaces`.
   *
   * @param {String} namespaces
   * @api private
   */
  
  function save(namespaces) {
    try {
      if (null == namespaces) {
        storage.removeItem('debug');
      } else {
        storage.debug = namespaces;
      }
    } catch(e) {}
  }
  
  /**
   * Load `namespaces`.
   *
   * @return {String} returns the previously persisted debug modes
   * @api private
   */
  
  function load() {
    var r;
    try {
      r = storage.debug;
    } catch(e) {}
    return r;
  }
  
  /**
   * Enable namespaces listed in `localStorage.debug` initially.
   */
  
  exports.enable(load());
  
  /**
   * Localstorage attempts to return the localstorage.
   *
   * This is necessary because safari throws
   * when a user disables cookies/localstorage
   * and you attempt to access it.
   *
   * @return {LocalStorage}
   * @api private
   */
  
  function localstorage(){
    try {
      return window.localStorage;
    } catch (e) {}
  }
  
  },{"43":43}],43:[function(_dereq_,module,exports){
  
  /**
   * This is the common logic for both the Node.js and web browser
   * implementations of `debug()`.
   *
   * Expose `debug()` as the module.
   */
  
  exports = module.exports = debug;
  exports.coerce = coerce;
  exports.disable = disable;
  exports.enable = enable;
  exports.enabled = enabled;
  exports.humanize = _dereq_(44);
  
  /**
   * The currently active debug mode names, and names to skip.
   */
  
  exports.names = [];
  exports.skips = [];
  
  /**
   * Map of special "%n" handling functions, for the debug "format" argument.
   *
   * Valid key names are a single, lowercased letter, i.e. "n".
   */
  
  exports.formatters = {};
  
  /**
   * Previously assigned color.
   */
  
  var prevColor = 0;
  
  /**
   * Previous log timestamp.
   */
  
  var prevTime;
  
  /**
   * Select a color.
   *
   * @return {Number}
   * @api private
   */
  
  function selectColor() {
    return exports.colors[prevColor++ % exports.colors.length];
  }
  
  /**
   * Create a debugger with the given `namespace`.
   *
   * @param {String} namespace
   * @return {Function}
   * @api public
   */
  
  function debug(namespace) {
  
    // define the `disabled` version
    function disabled() {
    }
    disabled.enabled = false;
  
    // define the `enabled` version
    function enabled() {
  
      var self = enabled;
  
      // set `diff` timestamp
      var curr = +new Date();
      var ms = curr - (prevTime || curr);
      self.diff = ms;
      self.prev = prevTime;
      self.curr = curr;
      prevTime = curr;
  
      // add the `color` if not set
      if (null == self.useColors) self.useColors = exports.useColors();
      if (null == self.color && self.useColors) self.color = selectColor();
  
      var args = Array.prototype.slice.call(arguments);
  
      args[0] = exports.coerce(args[0]);
  
      if ('string' !== typeof args[0]) {
        // anything else let's inspect with %o
        args = ['%o'].concat(args);
      }
  
      // apply any `formatters` transformations
      var index = 0;
      args[0] = args[0].replace(/%([a-z%])/g, function(match, format) {
        // if we encounter an escaped % then don't increase the array index
        if (match === '%') return match;
        index++;
        var formatter = exports.formatters[format];
        if ('function' === typeof formatter) {
          var val = args[index];
          match = formatter.call(self, val);
  
          // now we need to remove `args[index]` since it's inlined in the `format`
          args.splice(index, 1);
          index--;
        }
        return match;
      });
  
      if ('function' === typeof exports.formatArgs) {
        args = exports.formatArgs.apply(self, args);
      }
      var logFn = enabled.log || exports.log || console.log.bind(console);
      logFn.apply(self, args);
    }
    enabled.enabled = true;
  
    var fn = exports.enabled(namespace) ? enabled : disabled;
  
    fn.namespace = namespace;
  
    return fn;
  }
  
  /**
   * Enables a debug mode by namespaces. This can include modes
   * separated by a colon and wildcards.
   *
   * @param {String} namespaces
   * @api public
   */
  
  function enable(namespaces) {
    exports.save(namespaces);
  
    var split = (namespaces || '').split(/[\s,]+/);
    var len = split.length;
  
    for (var i = 0; i < len; i++) {
      if (!split[i]) continue; // ignore empty strings
      namespaces = split[i].replace(/\*/g, '.*?');
      if (namespaces[0] === '-') {
        exports.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
      } else {
        exports.names.push(new RegExp('^' + namespaces + '$'));
      }
    }
  }
  
  /**
   * Disable debug output.
   *
   * @api public
   */
  
  function disable() {
    exports.enable('');
  }
  
  /**
   * Returns true if the given mode name is enabled, false otherwise.
   *
   * @param {String} name
   * @return {Boolean}
   * @api public
   */
  
  function enabled(name) {
    var i, len;
    for (i = 0, len = exports.skips.length; i < len; i++) {
      if (exports.skips[i].test(name)) {
        return false;
      }
    }
    for (i = 0, len = exports.names.length; i < len; i++) {
      if (exports.names[i].test(name)) {
        return true;
      }
    }
    return false;
  }
  
  /**
   * Coerce `val`.
   *
   * @param {Mixed} val
   * @return {Mixed}
   * @api private
   */
  
  function coerce(val) {
    if (val instanceof Error) return val.stack || val.message;
    return val;
  }
  
  },{"44":44}],44:[function(_dereq_,module,exports){
  /**
   * Helpers.
   */
  
  var s = 1000;
  var m = s * 60;
  var h = m * 60;
  var d = h * 24;
  var y = d * 365.25;
  
  /**
   * Parse or format the given `val`.
   *
   * Options:
   *
   *  - `long` verbose formatting [false]
   *
   * @param {String|Number} val
   * @param {Object} options
   * @return {String|Number}
   * @api public
   */
  
  module.exports = function(val, options){
    options = options || {};
    if ('string' == typeof val) return parse(val);
    return options["long"]
      ? long(val)
      : short(val);
  };
  
  /**
   * Parse the given `str` and return milliseconds.
   *
   * @param {String} str
   * @return {Number}
   * @api private
   */
  
  function parse(str) {
    var match = /^((?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|years?|yrs?|y)?$/i.exec(str);
    if (!match) return;
    var n = parseFloat(match[1]);
    var type = (match[2] || 'ms').toLowerCase();
    switch (type) {
      case 'years':
      case 'year':
      case 'yrs':
      case 'yr':
      case 'y':
        return n * y;
      case 'days':
      case 'day':
      case 'd':
        return n * d;
      case 'hours':
      case 'hour':
      case 'hrs':
      case 'hr':
      case 'h':
        return n * h;
      case 'minutes':
      case 'minute':
      case 'mins':
      case 'min':
      case 'm':
        return n * m;
      case 'seconds':
      case 'second':
      case 'secs':
      case 'sec':
      case 's':
        return n * s;
      case 'milliseconds':
      case 'millisecond':
      case 'msecs':
      case 'msec':
      case 'ms':
        return n;
    }
  }
  
  /**
   * Short format for `ms`.
   *
   * @param {Number} ms
   * @return {String}
   * @api private
   */
  
  function short(ms) {
    if (ms >= d) return Math.round(ms / d) + 'd';
    if (ms >= h) return Math.round(ms / h) + 'h';
    if (ms >= m) return Math.round(ms / m) + 'm';
    if (ms >= s) return Math.round(ms / s) + 's';
    return ms + 'ms';
  }
  
  /**
   * Long format for `ms`.
   *
   * @param {Number} ms
   * @return {String}
   * @api private
   */
  
  function long(ms) {
    return plural(ms, d, 'day')
      || plural(ms, h, 'hour')
      || plural(ms, m, 'minute')
      || plural(ms, s, 'second')
      || ms + ' ms';
  }
  
  /**
   * Pluralization helper.
   */
  
  function plural(ms, n, name) {
    if (ms < n) return;
    if (ms < n * 1.5) return Math.floor(ms / n) + ' ' + name;
    return Math.ceil(ms / n) + ' ' + name + 's';
  }
  
  },{}],45:[function(_dereq_,module,exports){
  if (typeof Object.create === 'function') {
    // implementation from standard node.js 'util' module
    module.exports = function inherits(ctor, superCtor) {
      ctor.super_ = superCtor
      ctor.prototype = Object.create(superCtor.prototype, {
        constructor: {
          value: ctor,
          enumerable: false,
          writable: true,
          configurable: true
        }
      });
    };
  } else {
    // old school shim for old browsers
    module.exports = function inherits(ctor, superCtor) {
      ctor.super_ = superCtor
      var TempCtor = function () {}
      TempCtor.prototype = superCtor.prototype
      ctor.prototype = new TempCtor()
      ctor.prototype.constructor = ctor
    }
  }
  
  },{}],46:[function(_dereq_,module,exports){
  'use strict';
  
  module.exports = INTERNAL;
  
  function INTERNAL() {}
  },{}],47:[function(_dereq_,module,exports){
  'use strict';
  var Promise = _dereq_(50);
  var reject = _dereq_(53);
  var resolve = _dereq_(54);
  var INTERNAL = _dereq_(46);
  var handlers = _dereq_(48);
  module.exports = all;
  function all(iterable) {
    if (Object.prototype.toString.call(iterable) !== '[object Array]') {
      return reject(new TypeError('must be an array'));
    }
  
    var len = iterable.length;
    var called = false;
    if (!len) {
      return resolve([]);
    }
  
    var values = new Array(len);
    var resolved = 0;
    var i = -1;
    var promise = new Promise(INTERNAL);
    
    while (++i < len) {
      allResolver(iterable[i], i);
    }
    return promise;
    function allResolver(value, i) {
      resolve(value).then(resolveFromAll, function (error) {
        if (!called) {
          called = true;
          handlers.reject(promise, error);
        }
      });
      function resolveFromAll(outValue) {
        values[i] = outValue;
        if (++resolved === len & !called) {
          called = true;
          handlers.resolve(promise, values);
        }
      }
    }
  }
  },{"46":46,"48":48,"50":50,"53":53,"54":54}],48:[function(_dereq_,module,exports){
  'use strict';
  var tryCatch = _dereq_(57);
  var resolveThenable = _dereq_(55);
  var states = _dereq_(56);
  
  exports.resolve = function (self, value) {
    var result = tryCatch(getThen, value);
    if (result.status === 'error') {
      return exports.reject(self, result.value);
    }
    var thenable = result.value;
  
    if (thenable) {
      resolveThenable.safely(self, thenable);
    } else {
      self.state = states.FULFILLED;
      self.outcome = value;
      var i = -1;
      var len = self.queue.length;
      while (++i < len) {
        self.queue[i].callFulfilled(value);
      }
    }
    return self;
  };
  exports.reject = function (self, error) {
    self.state = states.REJECTED;
    self.outcome = error;
    var i = -1;
    var len = self.queue.length;
    while (++i < len) {
      self.queue[i].callRejected(error);
    }
    return self;
  };
  
  function getThen(obj) {
    // Make sure we only access the accessor once as required by the spec
    var then = obj && obj.then;
    if (obj && typeof obj === 'object' && typeof then === 'function') {
      return function appyThen() {
        then.apply(obj, arguments);
      };
    }
  }
  },{"55":55,"56":56,"57":57}],49:[function(_dereq_,module,exports){
  module.exports = exports = _dereq_(50);
  
  exports.resolve = _dereq_(54);
  exports.reject = _dereq_(53);
  exports.all = _dereq_(47);
  exports.race = _dereq_(52);
  },{"47":47,"50":50,"52":52,"53":53,"54":54}],50:[function(_dereq_,module,exports){
  'use strict';
  
  var unwrap = _dereq_(58);
  var INTERNAL = _dereq_(46);
  var resolveThenable = _dereq_(55);
  var states = _dereq_(56);
  var QueueItem = _dereq_(51);
  
  module.exports = Promise;
  function Promise(resolver) {
    if (!(this instanceof Promise)) {
      return new Promise(resolver);
    }
    if (typeof resolver !== 'function') {
      throw new TypeError('resolver must be a function');
    }
    this.state = states.PENDING;
    this.queue = [];
    this.outcome = void 0;
    if (resolver !== INTERNAL) {
      resolveThenable.safely(this, resolver);
    }
  }
  
  Promise.prototype['catch'] = function (onRejected) {
    return this.then(null, onRejected);
  };
  Promise.prototype.then = function (onFulfilled, onRejected) {
    if (typeof onFulfilled !== 'function' && this.state === states.FULFILLED ||
      typeof onRejected !== 'function' && this.state === states.REJECTED) {
      return this;
    }
    var promise = new Promise(INTERNAL);
  
    
    if (this.state !== states.PENDING) {
      var resolver = this.state === states.FULFILLED ? onFulfilled: onRejected;
      unwrap(promise, resolver, this.outcome);
    } else {
      this.queue.push(new QueueItem(promise, onFulfilled, onRejected));
    }
  
    return promise;
  };
  
  },{"46":46,"51":51,"55":55,"56":56,"58":58}],51:[function(_dereq_,module,exports){
  'use strict';
  var handlers = _dereq_(48);
  var unwrap = _dereq_(58);
  
  module.exports = QueueItem;
  function QueueItem(promise, onFulfilled, onRejected) {
    this.promise = promise;
    if (typeof onFulfilled === 'function') {
      this.onFulfilled = onFulfilled;
      this.callFulfilled = this.otherCallFulfilled;
    }
    if (typeof onRejected === 'function') {
      this.onRejected = onRejected;
      this.callRejected = this.otherCallRejected;
    }
  }
  QueueItem.prototype.callFulfilled = function (value) {
    handlers.resolve(this.promise, value);
  };
  QueueItem.prototype.otherCallFulfilled = function (value) {
    unwrap(this.promise, this.onFulfilled, value);
  };
  QueueItem.prototype.callRejected = function (value) {
    handlers.reject(this.promise, value);
  };
  QueueItem.prototype.otherCallRejected = function (value) {
    unwrap(this.promise, this.onRejected, value);
  };
  },{"48":48,"58":58}],52:[function(_dereq_,module,exports){
  'use strict';
  var Promise = _dereq_(50);
  var reject = _dereq_(53);
  var resolve = _dereq_(54);
  var INTERNAL = _dereq_(46);
  var handlers = _dereq_(48);
  module.exports = race;
  function race(iterable) {
    if (Object.prototype.toString.call(iterable) !== '[object Array]') {
      return reject(new TypeError('must be an array'));
    }
  
    var len = iterable.length;
    var called = false;
    if (!len) {
      return resolve([]);
    }
  
    var resolved = 0;
    var i = -1;
    var promise = new Promise(INTERNAL);
    
    while (++i < len) {
      resolver(iterable[i]);
    }
    return promise;
    function resolver(value) {
      resolve(value).then(function (response) {
        if (!called) {
          called = true;
          handlers.resolve(promise, response);
        }
      }, function (error) {
        if (!called) {
          called = true;
          handlers.reject(promise, error);
        }
      });
    }
  }
  },{"46":46,"48":48,"50":50,"53":53,"54":54}],53:[function(_dereq_,module,exports){
  'use strict';
  
  var Promise = _dereq_(50);
  var INTERNAL = _dereq_(46);
  var handlers = _dereq_(48);
  module.exports = reject;
  
  function reject(reason) {
  	var promise = new Promise(INTERNAL);
  	return handlers.reject(promise, reason);
  }
  },{"46":46,"48":48,"50":50}],54:[function(_dereq_,module,exports){
  'use strict';
  
  var Promise = _dereq_(50);
  var INTERNAL = _dereq_(46);
  var handlers = _dereq_(48);
  module.exports = resolve;
  
  var FALSE = handlers.resolve(new Promise(INTERNAL), false);
  var NULL = handlers.resolve(new Promise(INTERNAL), null);
  var UNDEFINED = handlers.resolve(new Promise(INTERNAL), void 0);
  var ZERO = handlers.resolve(new Promise(INTERNAL), 0);
  var EMPTYSTRING = handlers.resolve(new Promise(INTERNAL), '');
  
  function resolve(value) {
    if (value) {
      if (value instanceof Promise) {
        return value;
      }
      return handlers.resolve(new Promise(INTERNAL), value);
    }
    var valueType = typeof value;
    switch (valueType) {
      case 'boolean':
        return FALSE;
      case 'undefined':
        return UNDEFINED;
      case 'object':
        return NULL;
      case 'number':
        return ZERO;
      case 'string':
        return EMPTYSTRING;
    }
  }
  },{"46":46,"48":48,"50":50}],55:[function(_dereq_,module,exports){
  'use strict';
  var handlers = _dereq_(48);
  var tryCatch = _dereq_(57);
  function safelyResolveThenable(self, thenable) {
    // Either fulfill, reject or reject with error
    var called = false;
    function onError(value) {
      if (called) {
        return;
      }
      called = true;
      handlers.reject(self, value);
    }
  
    function onSuccess(value) {
      if (called) {
        return;
      }
      called = true;
      handlers.resolve(self, value);
    }
  
    function tryToUnwrap() {
      thenable(onSuccess, onError);
    }
    
    var result = tryCatch(tryToUnwrap);
    if (result.status === 'error') {
      onError(result.value);
    }
  }
  exports.safely = safelyResolveThenable;
  },{"48":48,"57":57}],56:[function(_dereq_,module,exports){
  // Lazy man's symbols for states
  
  exports.REJECTED = ['REJECTED'];
  exports.FULFILLED = ['FULFILLED'];
  exports.PENDING = ['PENDING'];
  },{}],57:[function(_dereq_,module,exports){
  'use strict';
  
  module.exports = tryCatch;
  
  function tryCatch(func, value) {
    var out = {};
    try {
      out.value = func(value);
      out.status = 'success';
    } catch (e) {
      out.status = 'error';
      out.value = e;
    }
    return out;
  }
  },{}],58:[function(_dereq_,module,exports){
  'use strict';
  
  var immediate = _dereq_(59);
  var handlers = _dereq_(48);
  module.exports = unwrap;
  
  function unwrap(promise, func, value) {
    immediate(function () {
      var returnValue;
      try {
        returnValue = func(value);
      } catch (e) {
        return handlers.reject(promise, e);
      }
      if (returnValue === promise) {
        handlers.reject(promise, new TypeError('Cannot resolve promise with itself'));
      } else {
        handlers.resolve(promise, returnValue);
      }
    });
  }
  },{"48":48,"59":59}],59:[function(_dereq_,module,exports){
  'use strict';
  var types = [
    _dereq_(39),
    _dereq_(61),
    _dereq_(60),
    _dereq_(62),
    _dereq_(63)
  ];
  var draining;
  var currentQueue;
  var queueIndex = -1;
  var queue = [];
  function cleanUpNextTick() {
      draining = false;
      if (currentQueue && currentQueue.length) {
        queue = currentQueue.concat(queue);
      } else {
        queueIndex = -1;
      }
      if (queue.length) {
        nextTick();
      }
  }
  
  //named nextTick for less confusing stack traces
  function nextTick() {
    draining = true;
    var len = queue.length;
    var timeout = setTimeout(cleanUpNextTick);
    while (len) {
      currentQueue = queue;
      queue = [];
      while (++queueIndex < len) {
        currentQueue[queueIndex]();
      }
      queueIndex = -1;
      len = queue.length;
    }
    queueIndex = -1;
    draining = false;
    clearTimeout(timeout);
  }
  var scheduleDrain;
  var i = -1;
  var len = types.length;
  while (++ i < len) {
    if (types[i] && types[i].test && types[i].test()) {
      scheduleDrain = types[i].install(nextTick);
      break;
    }
  }
  module.exports = immediate;
  function immediate(task) {
    if (queue.push(task) === 1 && !draining) {
      scheduleDrain();
    }
  }
  },{"39":39,"60":60,"61":61,"62":62,"63":63}],60:[function(_dereq_,module,exports){
  (function (global){
  'use strict';
  
  exports.test = function () {
    if (global.setImmediate) {
      // we can only get here in IE10
      // which doesn't handel postMessage well
      return false;
    }
    return typeof global.MessageChannel !== 'undefined';
  };
  
  exports.install = function (func) {
    var channel = new global.MessageChannel();
    channel.port1.onmessage = func;
    return function () {
      channel.port2.postMessage(0);
    };
  };
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],61:[function(_dereq_,module,exports){
  (function (global){
  'use strict';
  //based off rsvp https://github.com/tildeio/rsvp.js
  //license https://github.com/tildeio/rsvp.js/blob/master/LICENSE
  //https://github.com/tildeio/rsvp.js/blob/master/lib/rsvp/asap.js
  
  var Mutation = global.MutationObserver || global.WebKitMutationObserver;
  
  exports.test = function () {
    return Mutation;
  };
  
  exports.install = function (handle) {
    var called = 0;
    var observer = new Mutation(handle);
    var element = global.document.createTextNode('');
    observer.observe(element, {
      characterData: true
    });
    return function () {
      element.data = (called = ++called % 2);
    };
  };
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],62:[function(_dereq_,module,exports){
  (function (global){
  'use strict';
  
  exports.test = function () {
    return 'document' in global && 'onreadystatechange' in global.document.createElement('script');
  };
  
  exports.install = function (handle) {
    return function () {
  
      // Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
      // into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
      var scriptEl = global.document.createElement('script');
      scriptEl.onreadystatechange = function () {
        handle();
  
        scriptEl.onreadystatechange = null;
        scriptEl.parentNode.removeChild(scriptEl);
        scriptEl = null;
      };
      global.document.documentElement.appendChild(scriptEl);
  
      return handle;
    };
  };
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],63:[function(_dereq_,module,exports){
  'use strict';
  exports.test = function () {
    return true;
  };
  
  exports.install = function (t) {
    return function () {
      setTimeout(t, 0);
    };
  };
  },{}],64:[function(_dereq_,module,exports){
  'use strict';
  
  var MIN_MAGNITUDE = -324; // verified by -Number.MIN_VALUE
  var MAGNITUDE_DIGITS = 3; // ditto
  var SEP = ''; // set to '_' for easier debugging 
  
  var utils = _dereq_(65);
  
  exports.collate = function (a, b) {
  
    if (a === b) {
      return 0;
    }
  
    a = exports.normalizeKey(a);
    b = exports.normalizeKey(b);
  
    var ai = collationIndex(a);
    var bi = collationIndex(b);
    if ((ai - bi) !== 0) {
      return ai - bi;
    }
    if (a === null) {
      return 0;
    }
    switch (typeof a) {
      case 'number':
        return a - b;
      case 'boolean':
        return a === b ? 0 : (a < b ? -1 : 1);
      case 'string':
        return stringCollate(a, b);
    }
    return Array.isArray(a) ? arrayCollate(a, b) : objectCollate(a, b);
  };
  
  // couch considers null/NaN/Infinity/-Infinity === undefined,
  // for the purposes of mapreduce indexes. also, dates get stringified.
  exports.normalizeKey = function (key) {
    switch (typeof key) {
      case 'undefined':
        return null;
      case 'number':
        if (key === Infinity || key === -Infinity || isNaN(key)) {
          return null;
        }
        return key;
      case 'object':
        var origKey = key;
        if (Array.isArray(key)) {
          var len = key.length;
          key = new Array(len);
          for (var i = 0; i < len; i++) {
            key[i] = exports.normalizeKey(origKey[i]);
          }
        } else if (key instanceof Date) {
          return key.toJSON();
        } else if (key !== null) { // generic object
          key = {};
          for (var k in origKey) {
            if (origKey.hasOwnProperty(k)) {
              var val = origKey[k];
              if (typeof val !== 'undefined') {
                key[k] = exports.normalizeKey(val);
              }
            }
          }
        }
    }
    return key;
  };
  
  function indexify(key) {
    if (key !== null) {
      switch (typeof key) {
        case 'boolean':
          return key ? 1 : 0;
        case 'number':
          return numToIndexableString(key);
        case 'string':
          // We've to be sure that key does not contain \u0000
          // Do order-preserving replacements:
          // 0 -> 1, 1
          // 1 -> 1, 2
          // 2 -> 2, 2
          return key
            .replace(/\u0002/g, '\u0002\u0002')
            .replace(/\u0001/g, '\u0001\u0002')
            .replace(/\u0000/g, '\u0001\u0001');
        case 'object':
          var isArray = Array.isArray(key);
          var arr = isArray ? key : Object.keys(key);
          var i = -1;
          var len = arr.length;
          var result = '';
          if (isArray) {
            while (++i < len) {
              result += exports.toIndexableString(arr[i]);
            }
          } else {
            while (++i < len) {
              var objKey = arr[i];
              result += exports.toIndexableString(objKey) +
                  exports.toIndexableString(key[objKey]);
            }
          }
          return result;
      }
    }
    return '';
  }
  
  // convert the given key to a string that would be appropriate
  // for lexical sorting, e.g. within a database, where the
  // sorting is the same given by the collate() function.
  exports.toIndexableString = function (key) {
    var zero = '\u0000';
    key = exports.normalizeKey(key);
    return collationIndex(key) + SEP + indexify(key) + zero;
  };
  
  function parseNumber(str, i) {
    var originalIdx = i;
    var num;
    var zero = str[i] === '1';
    if (zero) {
      num = 0;
      i++;
    } else {
      var neg = str[i] === '0';
      i++;
      var numAsString = '';
      var magAsString = str.substring(i, i + MAGNITUDE_DIGITS);
      var magnitude = parseInt(magAsString, 10) + MIN_MAGNITUDE;
      if (neg) {
        magnitude = -magnitude;
      }
      i += MAGNITUDE_DIGITS;
      while (true) {
        var ch = str[i];
        if (ch === '\u0000') {
          break;
        } else {
          numAsString += ch;
        }
        i++;
      }
      numAsString = numAsString.split('.');
      if (numAsString.length === 1) {
        num = parseInt(numAsString, 10);
      } else {
        num = parseFloat(numAsString[0] + '.' + numAsString[1]);
      }
      if (neg) {
        num = num - 10;
      }
      if (magnitude !== 0) {
        // parseFloat is more reliable than pow due to rounding errors
        // e.g. Number.MAX_VALUE would return Infinity if we did
        // num * Math.pow(10, magnitude);
        num = parseFloat(num + 'e' + magnitude);
      }
    }
    return {num: num, length : i - originalIdx};
  }
  
  // move up the stack while parsing
  // this function moved outside of parseIndexableString for performance
  function pop(stack, metaStack) {
    var obj = stack.pop();
  
    if (metaStack.length) {
      var lastMetaElement = metaStack[metaStack.length - 1];
      if (obj === lastMetaElement.element) {
        // popping a meta-element, e.g. an object whose value is another object
        metaStack.pop();
        lastMetaElement = metaStack[metaStack.length - 1];
      }
      var element = lastMetaElement.element;
      var lastElementIndex = lastMetaElement.index;
      if (Array.isArray(element)) {
        element.push(obj);
      } else if (lastElementIndex === stack.length - 2) { // obj with key+value
        var key = stack.pop();
        element[key] = obj;
      } else {
        stack.push(obj); // obj with key only
      }
    }
  }
  
  exports.parseIndexableString = function (str) {
    var stack = [];
    var metaStack = []; // stack for arrays and objects
    var i = 0;
  
    while (true) {
      var collationIndex = str[i++];
      if (collationIndex === '\u0000') {
        if (stack.length === 1) {
          return stack.pop();
        } else {
          pop(stack, metaStack);
          continue;
        }
      }
      switch (collationIndex) {
        case '1':
          stack.push(null);
          break;
        case '2':
          stack.push(str[i] === '1');
          i++;
          break;
        case '3':
          var parsedNum = parseNumber(str, i);
          stack.push(parsedNum.num);
          i += parsedNum.length;
          break;
        case '4':
          var parsedStr = '';
          while (true) {
            var ch = str[i];
            if (ch === '\u0000') {
              break;
            }
            parsedStr += ch;
            i++;
          }
          // perform the reverse of the order-preserving replacement
          // algorithm (see above)
          parsedStr = parsedStr.replace(/\u0001\u0001/g, '\u0000')
            .replace(/\u0001\u0002/g, '\u0001')
            .replace(/\u0002\u0002/g, '\u0002');
          stack.push(parsedStr);
          break;
        case '5':
          var arrayElement = { element: [], index: stack.length };
          stack.push(arrayElement.element);
          metaStack.push(arrayElement);
          break;
        case '6':
          var objElement = { element: {}, index: stack.length };
          stack.push(objElement.element);
          metaStack.push(objElement);
          break;
        default:
          throw new Error(
            'bad collationIndex or unexpectedly reached end of input: ' + collationIndex);
      }
    }
  };
  
  function arrayCollate(a, b) {
    var len = Math.min(a.length, b.length);
    for (var i = 0; i < len; i++) {
      var sort = exports.collate(a[i], b[i]);
      if (sort !== 0) {
        return sort;
      }
    }
    return (a.length === b.length) ? 0 :
      (a.length > b.length) ? 1 : -1;
  }
  function stringCollate(a, b) {
    // See: https://github.com/daleharvey/pouchdb/issues/40
    // This is incompatible with the CouchDB implementation, but its the
    // best we can do for now
    return (a === b) ? 0 : ((a > b) ? 1 : -1);
  }
  function objectCollate(a, b) {
    var ak = Object.keys(a), bk = Object.keys(b);
    var len = Math.min(ak.length, bk.length);
    for (var i = 0; i < len; i++) {
      // First sort the keys
      var sort = exports.collate(ak[i], bk[i]);
      if (sort !== 0) {
        return sort;
      }
      // if the keys are equal sort the values
      sort = exports.collate(a[ak[i]], b[bk[i]]);
      if (sort !== 0) {
        return sort;
      }
  
    }
    return (ak.length === bk.length) ? 0 :
      (ak.length > bk.length) ? 1 : -1;
  }
  // The collation is defined by erlangs ordered terms
  // the atoms null, true, false come first, then numbers, strings,
  // arrays, then objects
  // null/undefined/NaN/Infinity/-Infinity are all considered null
  function collationIndex(x) {
    var id = ['boolean', 'number', 'string', 'object'];
    var idx = id.indexOf(typeof x);
    //false if -1 otherwise true, but fast!!!!1
    if (~idx) {
      if (x === null) {
        return 1;
      }
      if (Array.isArray(x)) {
        return 5;
      }
      return idx < 3 ? (idx + 2) : (idx + 3);
    }
    if (Array.isArray(x)) {
      return 5;
    }
  }
  
  // conversion:
  // x yyy zz...zz
  // x = 0 for negative, 1 for 0, 2 for positive
  // y = exponent (for negative numbers negated) moved so that it's >= 0
  // z = mantisse
  function numToIndexableString(num) {
  
    if (num === 0) {
      return '1';
    }
  
    // convert number to exponential format for easier and
    // more succinct string sorting
    var expFormat = num.toExponential().split(/e\+?/);
    var magnitude = parseInt(expFormat[1], 10);
  
    var neg = num < 0;
  
    var result = neg ? '0' : '2';
  
    // first sort by magnitude
    // it's easier if all magnitudes are positive
    var magForComparison = ((neg ? -magnitude : magnitude) - MIN_MAGNITUDE);
    var magString = utils.padLeft((magForComparison).toString(), '0', MAGNITUDE_DIGITS);
  
    result += SEP + magString;
  
    // then sort by the factor
    var factor = Math.abs(parseFloat(expFormat[0])); // [1..10)
    if (neg) { // for negative reverse ordering
      factor = 10 - factor;
    }
  
    var factorStr = factor.toFixed(20);
  
    // strip zeros from the end
    factorStr = factorStr.replace(/\.?0+$/, '');
  
    result += SEP + factorStr;
  
    return result;
  }
  
  },{"65":65}],65:[function(_dereq_,module,exports){
  'use strict';
  
  function pad(str, padWith, upToLength) {
    var padding = '';
    var targetLength = upToLength - str.length;
    while (padding.length < targetLength) {
      padding += padWith;
    }
    return padding;
  }
  
  exports.padLeft = function (str, padWith, upToLength) {
    var padding = pad(str, padWith, upToLength);
    return padding + str;
  };
  
  exports.padRight = function (str, padWith, upToLength) {
    var padding = pad(str, padWith, upToLength);
    return str + padding;
  };
  
  exports.stringLexCompare = function (a, b) {
  
    var aLen = a.length;
    var bLen = b.length;
  
    var i;
    for (i = 0; i < aLen; i++) {
      if (i === bLen) {
        // b is shorter substring of a
        return 1;
      }
      var aChar = a.charAt(i);
      var bChar = b.charAt(i);
      if (aChar !== bChar) {
        return aChar < bChar ? -1 : 1;
      }
    }
  
    if (aLen < bLen) {
      // a is shorter substring of b
      return -1;
    }
  
    return 0;
  };
  
  /*
   * returns the decimal form for the given integer, i.e. writes
   * out all the digits (in base-10) instead of using scientific notation
   */
  exports.intToDecimalForm = function (int) {
  
    var isNeg = int < 0;
    var result = '';
  
    do {
      var remainder = isNeg ? -Math.ceil(int % 10) : Math.floor(int % 10);
  
      result = remainder + result;
      int = isNeg ? Math.ceil(int / 10) : Math.floor(int / 10);
    } while (int);
  
  
    if (isNeg && result !== '0') {
      result = '-' + result;
    }
  
    return result;
  };
  },{}],66:[function(_dereq_,module,exports){
  'use strict';
  exports.Map = LazyMap; // TODO: use ES6 map
  exports.Set = LazySet; // TODO: use ES6 set
  // based on https://github.com/montagejs/collections
  function LazyMap() {
    this.store = {};
  }
  LazyMap.prototype.mangle = function (key) {
    if (typeof key !== "string") {
      throw new TypeError("key must be a string but Got " + key);
    }
    return '$' + key;
  };
  LazyMap.prototype.unmangle = function (key) {
    return key.substring(1);
  };
  LazyMap.prototype.get = function (key) {
    var mangled = this.mangle(key);
    if (mangled in this.store) {
      return this.store[mangled];
    } else {
      return void 0;
    }
  };
  LazyMap.prototype.set = function (key, value) {
    var mangled = this.mangle(key);
    this.store[mangled] = value;
    return true;
  };
  LazyMap.prototype.has = function (key) {
    var mangled = this.mangle(key);
    return mangled in this.store;
  };
  LazyMap.prototype["delete"] = function (key) {
    var mangled = this.mangle(key);
    if (mangled in this.store) {
      delete this.store[mangled];
      return true;
    }
    return false;
  };
  LazyMap.prototype.forEach = function (cb) {
    var self = this;
    var keys = Object.keys(self.store);
    keys.forEach(function (key) {
      var value = self.store[key];
      key = self.unmangle(key);
      cb(value, key);
    });
  };
  
  function LazySet(array) {
    this.store = new LazyMap();
  
    // init with an array
    if (array && Array.isArray(array)) {
      for (var i = 0, len = array.length; i < len; i++) {
        this.add(array[i]);
      }
    }
  }
  LazySet.prototype.add = function (key) {
    return this.store.set(key, true);
  };
  LazySet.prototype.has = function (key) {
    return this.store.has(key);
  };
  LazySet.prototype["delete"] = function (key) {
    return this.store["delete"](key);
  };
  
  },{}],67:[function(_dereq_,module,exports){
  "use strict";
  
  // Extends method
  // (taken from http://code.jquery.com/jquery-1.9.0.js)
  // Populate the class2type map
  var class2type = {};
  
  var types = [
    "Boolean", "Number", "String", "Function", "Array",
    "Date", "RegExp", "Object", "Error"
  ];
  for (var i = 0; i < types.length; i++) {
    var typename = types[i];
    class2type["[object " + typename + "]"] = typename.toLowerCase();
  }
  
  var core_toString = class2type.toString;
  var core_hasOwn = class2type.hasOwnProperty;
  
  function type(obj) {
    if (obj === null) {
      return String(obj);
    }
    return typeof obj === "object" || typeof obj === "function" ?
      class2type[core_toString.call(obj)] || "object" :
      typeof obj;
  }
  
  function isWindow(obj) {
    return obj !== null && obj === obj.window;
  }
  
  function isPlainObject(obj) {
    // Must be an Object.
    // Because of IE, we also have to check the presence of
    // the constructor property.
    // Make sure that DOM nodes and window objects don't pass through, as well
    if (!obj || type(obj) !== "object" || obj.nodeType || isWindow(obj)) {
      return false;
    }
  
    try {
      // Not own constructor property must be Object
      if (obj.constructor &&
        !core_hasOwn.call(obj, "constructor") &&
        !core_hasOwn.call(obj.constructor.prototype, "isPrototypeOf")) {
        return false;
      }
    } catch ( e ) {
      // IE8,9 Will throw exceptions on certain host objects #9897
      return false;
    }
  
    // Own properties are enumerated firstly, so to speed up,
    // if last one is own, then all properties are own.
    var key;
    for (key in obj) {}
  
    return key === undefined || core_hasOwn.call(obj, key);
  }
  
  
  function isFunction(obj) {
    return type(obj) === "function";
  }
  
  var isArray = Array.isArray || function (obj) {
    return type(obj) === "array";
  };
  
  function extend() {
    // originally extend() was recursive, but this ended up giving us
    // "call stack exceeded", so it's been unrolled to use a literal stack
    // (see https://github.com/pouchdb/pouchdb/issues/2543)
    var stack = [];
    var i = -1;
    var len = arguments.length;
    var args = new Array(len);
    while (++i < len) {
      args[i] = arguments[i];
    }
    var container = {};
    stack.push({args: args, result: {container: container, key: 'key'}});
    var next;
    while ((next = stack.pop())) {
      extendInner(stack, next.args, next.result);
    }
    return container.key;
  }
  
  function extendInner(stack, args, result) {
    var options, name, src, copy, copyIsArray, clone,
      target = args[0] || {},
      i = 1,
      length = args.length,
      deep = false,
      numericStringRegex = /\d+/,
      optionsIsArray;
  
    // Handle a deep copy situation
    if (typeof target === "boolean") {
      deep = target;
      target = args[1] || {};
      // skip the boolean and the target
      i = 2;
    }
  
    // Handle case when target is a string or something (possible in deep copy)
    if (typeof target !== "object" && !isFunction(target)) {
      target = {};
    }
  
    // extend jQuery itself if only one argument is passed
    if (length === i) {
      /* jshint validthis: true */
      target = this;
      --i;
    }
  
    for (; i < length; i++) {
      // Only deal with non-null/undefined values
      if ((options = args[i]) != null) {
        optionsIsArray = isArray(options);
        // Extend the base object
        for (name in options) {
          //if (options.hasOwnProperty(name)) {
          if (!(name in Object.prototype)) {
            if (optionsIsArray && !numericStringRegex.test(name)) {
              continue;
            }
  
            src = target[name];
            copy = options[name];
  
            // Prevent never-ending loop
            if (target === copy) {
              continue;
            }
  
            // Recurse if we're merging plain objects or arrays
            if (deep && copy && (isPlainObject(copy) ||
                (copyIsArray = isArray(copy)))) {
              if (copyIsArray) {
                copyIsArray = false;
                clone = src && isArray(src) ? src : [];
  
              } else {
                clone = src && isPlainObject(src) ? src : {};
              }
  
              // Never move original objects, clone them
              stack.push({
                args: [deep, clone, copy],
                result: {
                  container: target,
                  key: name
                }
              });
  
            // Don't bring in undefined values
            } else if (copy !== undefined) {
              if (!(isArray(options) && isFunction(copy))) {
                target[name] = copy;
              }
            }
          }
        }
      }
    }
  
    // "Return" the modified object by setting the key
    // on the given container
    result.container[result.key] = target;
  }
  
  
  module.exports = extend;
  
  
  
  },{}],68:[function(_dereq_,module,exports){
  'use strict';
  
  var upsert = _dereq_(72);
  var utils = _dereq_(73);
  var Promise = utils.Promise;
  
  module.exports = function (opts) {
    var sourceDB = opts.db;
    var viewName = opts.viewName;
    var mapFun = opts.map;
    var reduceFun = opts.reduce;
    var temporary = opts.temporary;
  
    // the "undefined" part is for backwards compatibility
    var viewSignature = mapFun.toString() + (reduceFun && reduceFun.toString()) +
      'undefined';
  
    if (!temporary && sourceDB._cachedViews) {
      var cachedView = sourceDB._cachedViews[viewSignature];
      if (cachedView) {
        return Promise.resolve(cachedView);
      }
    }
  
    return sourceDB.info().then(function (info) {
  
      var depDbName = info.db_name + '-mrview-' +
        (temporary ? 'temp' : utils.MD5(viewSignature));
  
      // save the view name in the source PouchDB so it can be cleaned up if necessary
      // (e.g. when the _design doc is deleted, remove all associated view data)
      function diffFunction(doc) {
        doc.views = doc.views || {};
        var fullViewName = viewName;
        if (fullViewName.indexOf('/') === -1) {
          fullViewName = viewName + '/' + viewName;
        }
        var depDbs = doc.views[fullViewName] = doc.views[fullViewName] || {};
        /* istanbul ignore if */
        if (depDbs[depDbName]) {
          return; // no update necessary
        }
        depDbs[depDbName] = true;
        return doc;
      }
      return upsert(sourceDB, '_local/mrviews', diffFunction).then(function () {
        return sourceDB.registerDependentDatabase(depDbName).then(function (res) {
          var db = res.db;
          db.auto_compaction = true;
          var view = {
            name: depDbName,
            db: db, 
            sourceDB: sourceDB,
            adapter: sourceDB.adapter,
            mapFun: mapFun,
            reduceFun: reduceFun
          };
          return view.db.get('_local/lastSeq')["catch"](function (err) {
            /* istanbul ignore if */
            if (err.status !== 404) {
              throw err;
            }
          }).then(function (lastSeqDoc) {
            view.seq = lastSeqDoc ? lastSeqDoc.seq : 0;
            if (!temporary) {
              sourceDB._cachedViews = sourceDB._cachedViews || {};
              sourceDB._cachedViews[viewSignature] = view;
              view.db.on('destroyed', function () {
                delete sourceDB._cachedViews[viewSignature];
              });
            }
            return view;
          });
        });
      });
    });
  };
  
  },{"72":72,"73":73}],69:[function(_dereq_,module,exports){
  'use strict';
  
  module.exports = function (func, emit, sum, log, isArray, toJSON) {
    /*jshint evil:true,unused:false */
    return eval("'use strict'; (" + func.replace(/;\s*$/, "") + ");");
  };
  
  },{}],70:[function(_dereq_,module,exports){
  (function (process){
  'use strict';
  
  var pouchCollate = _dereq_(64);
  var TaskQueue = _dereq_(71);
  var collate = pouchCollate.collate;
  var toIndexableString = pouchCollate.toIndexableString;
  var normalizeKey = pouchCollate.normalizeKey;
  var createView = _dereq_(68);
  var evalFunc = _dereq_(69);
  var log; 
  /* istanbul ignore else */
  if ((typeof console !== 'undefined') && (typeof console.log === 'function')) {
    log = Function.prototype.bind.call(console.log, console);
  } else {
    log = function () {};
  }
  var utils = _dereq_(73);
  var Promise = utils.Promise;
  var persistentQueues = {};
  var tempViewQueue = new TaskQueue();
  var CHANGES_BATCH_SIZE = 50;
  
  function parseViewName(name) {
    // can be either 'ddocname/viewname' or just 'viewname'
    // (where the ddoc name is the same)
    return name.indexOf('/') === -1 ? [name, name] : name.split('/');
  }
  
  function isGenOne(changes) {
    // only return true if the current change is 1-
    // and there are no other leafs
    return changes.length === 1 && /^1-/.test(changes[0].rev);
  }
  
  function emitError(db, e) {
    try {
      db.emit('error', e);
    } catch (err) {
      console.error(
        'The user\'s map/reduce function threw an uncaught error.\n' +
        'You can debug this error by doing:\n' +
        'myDatabase.on(\'error\', function (err) { debugger; });\n' +
        'Please double-check your map/reduce function.');
      console.error(e);
    }
  }
  
  function tryCode(db, fun, args) {
    // emit an event if there was an error thrown by a map/reduce function.
    // putting try/catches in a single function also avoids deoptimizations.
    try {
      return {
        output : fun.apply(null, args)
      };
    } catch (e) {
      emitError(db, e);
      return {error: e};
    }
  }
  
  function sortByKeyThenValue(x, y) {
    var keyCompare = collate(x.key, y.key);
    return keyCompare !== 0 ? keyCompare : collate(x.value, y.value);
  }
  
  function sliceResults(results, limit, skip) {
    skip = skip || 0;
    if (typeof limit === 'number') {
      return results.slice(skip, limit + skip);
    } else if (skip > 0) {
      return results.slice(skip);
    }
    return results;
  }
  
  function rowToDocId(row) {
    var val = row.value;
    // Users can explicitly specify a joined doc _id, or it
    // defaults to the doc _id that emitted the key/value.
    var docId = (val && typeof val === 'object' && val._id) || row.id;
    return docId;
  }
  
  function createBuiltInError(name) {
    var message = 'builtin ' + name +
      ' function requires map values to be numbers' +
      ' or number arrays';
    return new BuiltInError(message);
  }
  
  function sum(values) {
    var result = 0;
    for (var i = 0, len = values.length; i < len; i++) {
      var num = values[i];
      if (typeof num !== 'number') {
        if (Array.isArray(num)) {
          // lists of numbers are also allowed, sum them separately
          result = typeof result === 'number' ? [result] : result;
          for (var j = 0, jLen = num.length; j < jLen; j++) {
            var jNum = num[j];
            if (typeof jNum !== 'number') {
              throw createBuiltInError('_sum');
            } else if (typeof result[j] === 'undefined') {
              result.push(jNum);
            } else {
              result[j] += jNum;
            }
          }
        } else { // not array/number
          throw createBuiltInError('_sum');
        }
      } else if (typeof result === 'number') {
        result += num;
      } else { // add number to array
        result[0] += num;
      }
    }
    return result;
  }
  
  var builtInReduce = {
    _sum: function (keys, values) {
      return sum(values);
    },
  
    _count: function (keys, values) {
      return values.length;
    },
  
    _stats: function (keys, values) {
      // no need to implement rereduce=true, because Pouch
      // will never call it
      function sumsqr(values) {
        var _sumsqr = 0;
        for (var i = 0, len = values.length; i < len; i++) {
          var num = values[i];
          _sumsqr += (num * num);
        }
        return _sumsqr;
      }
      return {
        sum     : sum(values),
        min     : Math.min.apply(null, values),
        max     : Math.max.apply(null, values),
        count   : values.length,
        sumsqr : sumsqr(values)
      };
    }
  };
  
  function addHttpParam(paramName, opts, params, asJson) {
    // add an http param from opts to params, optionally json-encoded
    var val = opts[paramName];
    if (typeof val !== 'undefined') {
      if (asJson) {
        val = encodeURIComponent(JSON.stringify(val));
      }
      params.push(paramName + '=' + val);
    }
  }
  
  function checkQueryParseError(options, fun) {
    var startkeyName = options.descending ? 'endkey' : 'startkey';
    var endkeyName = options.descending ? 'startkey' : 'endkey';
  
    if (typeof options[startkeyName] !== 'undefined' &&
      typeof options[endkeyName] !== 'undefined' &&
      collate(options[startkeyName], options[endkeyName]) > 0) {
      throw new QueryParseError('No rows can match your key range, reverse your ' +
          'start_key and end_key or set {descending : true}');
    } else if (fun.reduce && options.reduce !== false) {
      if (options.include_docs) {
        throw new QueryParseError('{include_docs:true} is invalid for reduce');
      } else if (options.keys && options.keys.length > 1 &&
          !options.group && !options.group_level) {
        throw new QueryParseError('Multi-key fetches for reduce views must use {group: true}');
      }
    }
    if (options.group_level) {
      if (typeof options.group_level !== 'number') {
        throw new QueryParseError('Invalid value for integer: "' + options.group_level + '"');
      }
      if (options.group_level < 0) {
        throw new QueryParseError('Invalid value for positive integer: ' +
          '"' + options.group_level + '"');
      }
    }
  }
  
  function httpQuery(db, fun, opts) {
    // List of parameters to add to the PUT request
    var params = [];
    var body;
    var method = 'GET';
  
    // If opts.reduce exists and is defined, then add it to the list
    // of parameters.
    // If reduce=false then the results are that of only the map function
    // not the final result of map and reduce.
    addHttpParam('reduce', opts, params);
    addHttpParam('include_docs', opts, params);
    addHttpParam('attachments', opts, params);
    addHttpParam('limit', opts, params);
    addHttpParam('descending', opts, params);
    addHttpParam('group', opts, params);
    addHttpParam('group_level', opts, params);
    addHttpParam('skip', opts, params);
    addHttpParam('stale', opts, params);
    addHttpParam('conflicts', opts, params);
    addHttpParam('startkey', opts, params, true);
    addHttpParam('endkey', opts, params, true);
    addHttpParam('inclusive_end', opts, params);
    addHttpParam('key', opts, params, true);
  
    // Format the list of parameters into a valid URI query string
    params = params.join('&');
    params = params === '' ? '' : '?' + params;
  
    // If keys are supplied, issue a POST request to circumvent GET query string limits
    // see http://wiki.apache.org/couchdb/HTTP_view_API#Querying_Options
    if (typeof opts.keys !== 'undefined') {
      var MAX_URL_LENGTH = 2000;
      // according to http://stackoverflow.com/a/417184/680742,
      // the de facto URL length limit is 2000 characters
  
      var keysAsString =
        'keys=' + encodeURIComponent(JSON.stringify(opts.keys));
      if (keysAsString.length + params.length + 1 <= MAX_URL_LENGTH) {
        // If the keys are short enough, do a GET. we do this to work around
        // Safari not understanding 304s on POSTs (see pouchdb/pouchdb#1239)
        params += (params[0] === '?' ? '&' : '?') + keysAsString;
      } else {
        method = 'POST';
        if (typeof fun === 'string') {
          body = JSON.stringify({keys: opts.keys});
        } else { // fun is {map : mapfun}, so append to this
          fun.keys = opts.keys;
        }
      }
    }
  
    // We are referencing a query defined in the design doc
    if (typeof fun === 'string') {
      var parts = parseViewName(fun);
      return db.request({
        method: method,
        url: '_design/' + parts[0] + '/_view/' + parts[1] + params,
        body: body
      });
    }
  
    // We are using a temporary view, terrible for performance but good for testing
    body = body || {};
    Object.keys(fun).forEach(function (key) {
      if (Array.isArray(fun[key])) {
        body[key] = fun[key];
      } else {
        body[key] = fun[key].toString();
      }
    });
    return db.request({
      method: 'POST',
      url: '_temp_view' + params,
      body: body
    });
  }
  
  function defaultsTo(value) {
    return function (reason) {
      /* istanbul ignore else */
      if (reason.status === 404) {
        return value;
      } else {
        throw reason;
      }
    };
  }
  
  // returns a promise for a list of docs to update, based on the input docId.
  // the order doesn't matter, because post-3.2.0, bulkDocs
  // is an atomic operation in all three adapters.
  function getDocsToPersist(docId, view, docIdsToChangesAndEmits) {
    var metaDocId = '_local/doc_' + docId;
    var defaultMetaDoc = {_id: metaDocId, keys: []};
    var docData = docIdsToChangesAndEmits[docId];
    var indexableKeysToKeyValues = docData.indexableKeysToKeyValues;
    var changes = docData.changes;
  
    function getMetaDoc() {
      if (isGenOne(changes)) {
        // generation 1, so we can safely assume initial state
        // for performance reasons (avoids unnecessary GETs)
        return Promise.resolve(defaultMetaDoc);
      }
      return view.db.get(metaDocId)["catch"](defaultsTo(defaultMetaDoc));
    }
  
    function getKeyValueDocs(metaDoc) {
      if (!metaDoc.keys.length) {
        // no keys, no need for a lookup
        return Promise.resolve({rows: []});
      }
      return view.db.allDocs({
        keys: metaDoc.keys,
        include_docs: true
      });
    }
  
    function processKvDocs(metaDoc, kvDocsRes) {
      var kvDocs = [];
      var oldKeysMap = {};
  
      for (var i = 0, len = kvDocsRes.rows.length; i < len; i++) {
        var row = kvDocsRes.rows[i];
        var doc = row.doc;
        if (!doc) { // deleted
          continue;
        }
        kvDocs.push(doc);
        oldKeysMap[doc._id] = true;
        doc._deleted = !indexableKeysToKeyValues[doc._id];
        if (!doc._deleted) {
          var keyValue = indexableKeysToKeyValues[doc._id];
          if ('value' in keyValue) {
            doc.value = keyValue.value;
          }
        }
      }
  
      var newKeys = Object.keys(indexableKeysToKeyValues);
      newKeys.forEach(function (key) {
        if (!oldKeysMap[key]) {
          // new doc
          var kvDoc = {
            _id: key
          };
          var keyValue = indexableKeysToKeyValues[key];
          if ('value' in keyValue) {
            kvDoc.value = keyValue.value;
          }
          kvDocs.push(kvDoc);
        }
      });
      metaDoc.keys = utils.uniq(newKeys.concat(metaDoc.keys));
      kvDocs.push(metaDoc);
  
      return kvDocs;
    }
  
    return getMetaDoc().then(function (metaDoc) {
      return getKeyValueDocs(metaDoc).then(function (kvDocsRes) {
        return processKvDocs(metaDoc, kvDocsRes);
      });
    });
  }
  
  // updates all emitted key/value docs and metaDocs in the mrview database
  // for the given batch of documents from the source database
  function saveKeyValues(view, docIdsToChangesAndEmits, seq) {
    var seqDocId = '_local/lastSeq';
    return view.db.get(seqDocId)[
    "catch"](defaultsTo({_id: seqDocId, seq: 0}))
    .then(function (lastSeqDoc) {
      var docIds = Object.keys(docIdsToChangesAndEmits);
      return Promise.all(docIds.map(function (docId) {
        return getDocsToPersist(docId, view, docIdsToChangesAndEmits);
      })).then(function (listOfDocsToPersist) {
        var docsToPersist = utils.flatten(listOfDocsToPersist);
        lastSeqDoc.seq = seq;
        docsToPersist.push(lastSeqDoc);
        // write all docs in a single operation, update the seq once
        return view.db.bulkDocs({docs : docsToPersist});
      });
    });
  }
  
  function getQueue(view) {
    var viewName = typeof view === 'string' ? view : view.name;
    var queue = persistentQueues[viewName];
    if (!queue) {
      queue = persistentQueues[viewName] = new TaskQueue();
    }
    return queue;
  }
  
  function updateView(view) {
    return utils.sequentialize(getQueue(view), function () {
      return updateViewInQueue(view);
    })();
  }
  
  function updateViewInQueue(view) {
    // bind the emit function once
    var mapResults;
    var doc;
  
    function emit(key, value) {
      var output = {id: doc._id, key: normalizeKey(key)};
      // Don't explicitly store the value unless it's defined and non-null.
      // This saves on storage space, because often people don't use it.
      if (typeof value !== 'undefined' && value !== null) {
        output.value = normalizeKey(value);
      }
      mapResults.push(output);
    }
  
    var mapFun;
    // for temp_views one can use emit(doc, emit), see #38
    if (typeof view.mapFun === "function" && view.mapFun.length === 2) {
      var origMap = view.mapFun;
      mapFun = function (doc) {
        return origMap(doc, emit);
      };
    } else {
      mapFun = evalFunc(view.mapFun.toString(), emit, sum, log, Array.isArray, JSON.parse);
    }
  
    var currentSeq = view.seq || 0;
  
    function processChange(docIdsToChangesAndEmits, seq) {
      return function () {
        return saveKeyValues(view, docIdsToChangesAndEmits, seq);
      };
    }
  
    var queue = new TaskQueue();
    // TODO(neojski): https://github.com/daleharvey/pouchdb/issues/1521
  
    return new Promise(function (resolve, reject) {
  
      function complete() {
        queue.finish().then(function () {
          view.seq = currentSeq;
          resolve();
        });
      }
  
      function processNextBatch() {
        view.sourceDB.changes({
          conflicts: true,
          include_docs: true,
          style: 'all_docs',
          since: currentSeq,
          limit: CHANGES_BATCH_SIZE
        }).on('complete', function (response) {
          var results = response.results;
          if (!results.length) {
            return complete();
          }
          var docIdsToChangesAndEmits = {};
          for (var i = 0, l = results.length; i < l; i++) {
            var change = results[i];
            if (change.doc._id[0] !== '_') {
              mapResults = [];
              doc = change.doc;
  
              if (!doc._deleted) {
                tryCode(view.sourceDB, mapFun, [doc]);
              }
              mapResults.sort(sortByKeyThenValue);
  
              var indexableKeysToKeyValues = {};
              var lastKey;
              for (var j = 0, jl = mapResults.length; j < jl; j++) {
                var obj = mapResults[j];
                var complexKey = [obj.key, obj.id];
                if (collate(obj.key, lastKey) === 0) {
                  complexKey.push(j); // dup key+id, so make it unique
                }
                var indexableKey = toIndexableString(complexKey);
                indexableKeysToKeyValues[indexableKey] = obj;
                lastKey = obj.key;
              }
              docIdsToChangesAndEmits[change.doc._id] = {
                indexableKeysToKeyValues: indexableKeysToKeyValues,
                changes: change.changes
              };
            }
            currentSeq = change.seq;
          }
          queue.add(processChange(docIdsToChangesAndEmits, currentSeq));
          if (results.length < CHANGES_BATCH_SIZE) {
            return complete();
          }
          return processNextBatch();
        }).on('error', onError);
        /* istanbul ignore next */
        function onError(err) {
          reject(err);
        }
      }
  
      processNextBatch();
    });
  }
  
  function reduceView(view, results, options) {
    if (options.group_level === 0) {
      delete options.group_level;
    }
  
    var shouldGroup = options.group || options.group_level;
  
    var reduceFun;
    if (builtInReduce[view.reduceFun]) {
      reduceFun = builtInReduce[view.reduceFun];
    } else {
      reduceFun = evalFunc(
        view.reduceFun.toString(), null, sum, log, Array.isArray, JSON.parse);
    }
  
    var groups = [];
    var lvl = options.group_level;
    results.forEach(function (e) {
      var last = groups[groups.length - 1];
      var key = shouldGroup ? e.key : null;
  
      // only set group_level for array keys
      if (shouldGroup && Array.isArray(key) && typeof lvl === 'number') {
        key = key.length > lvl ? key.slice(0, lvl) : key;
      }
  
      if (last && collate(last.key[0][0], key) === 0) {
        last.key.push([key, e.id]);
        last.value.push(e.value);
        return;
      }
      groups.push({key: [
        [key, e.id]
      ], value: [e.value]});
    });
    for (var i = 0, len = groups.length; i < len; i++) {
      var e = groups[i];
      var reduceTry = tryCode(view.sourceDB, reduceFun, [e.key, e.value, false]);
      if (reduceTry.error && reduceTry.error instanceof BuiltInError) {
        // CouchDB returns an error if a built-in errors out
        throw reduceTry.error;
      }
      // CouchDB just sets the value to null if a non-built-in errors out
      e.value = reduceTry.error ? null : reduceTry.output;
      e.key = e.key[0][0];
    }
    // no total_rows/offset when reducing
    return {rows: sliceResults(groups, options.limit, options.skip)};
  }
  
  function queryView(view, opts) {
    return utils.sequentialize(getQueue(view), function () {
      return queryViewInQueue(view, opts);
    })();
  }
  
  function queryViewInQueue(view, opts) {
    var totalRows;
    var shouldReduce = view.reduceFun && opts.reduce !== false;
    var skip = opts.skip || 0;
    if (typeof opts.keys !== 'undefined' && !opts.keys.length) {
      // equivalent query
      opts.limit = 0;
      delete opts.keys;
    }
  
    function fetchFromView(viewOpts) {
      viewOpts.include_docs = true;
      return view.db.allDocs(viewOpts).then(function (res) {
        totalRows = res.total_rows;
        return res.rows.map(function (result) {
  
          // implicit migration - in older versions of PouchDB,
          // we explicitly stored the doc as {id: ..., key: ..., value: ...}
          // this is tested in a migration test
          /* istanbul ignore next */
          if ('value' in result.doc && typeof result.doc.value === 'object' &&
              result.doc.value !== null) {
            var keys = Object.keys(result.doc.value).sort();
            // this detection method is not perfect, but it's unlikely the user
            // emitted a value which was an object with these 3 exact keys
            var expectedKeys = ['id', 'key', 'value'];
            if (!(keys < expectedKeys || keys > expectedKeys)) {
              return result.doc.value;
            }
          }
  
          var parsedKeyAndDocId = pouchCollate.parseIndexableString(result.doc._id);
          return {
            key: parsedKeyAndDocId[0],
            id: parsedKeyAndDocId[1],
            value: ('value' in result.doc ? result.doc.value : null)
          };
        });
      });
    }
  
    function onMapResultsReady(rows) {
      var finalResults;
      if (shouldReduce) {
        finalResults = reduceView(view, rows, opts);
      } else {
        finalResults = {
          total_rows: totalRows,
          offset: skip,
          rows: rows
        };
      }
      if (opts.include_docs) {
        var docIds = utils.uniq(rows.map(rowToDocId));
  
        return view.sourceDB.allDocs({
          keys: docIds,
          include_docs: true,
          conflicts: opts.conflicts,
          attachments: opts.attachments
        }).then(function (allDocsRes) {
          var docIdsToDocs = {};
          allDocsRes.rows.forEach(function (row) {
            if (row.doc) {
              docIdsToDocs['$' + row.id] = row.doc;
            }
          });
          rows.forEach(function (row) {
            var docId = rowToDocId(row);
            var doc = docIdsToDocs['$' + docId];
            if (doc) {
              row.doc = doc;
            }
          });
          return finalResults;
        });
      } else {
        return finalResults;
      }
    }
  
    var flatten = function (array) {
      return array.reduce(function (prev, cur) {
        return prev.concat(cur);
      });
    };
  
    if (typeof opts.keys !== 'undefined') {
      var keys = opts.keys;
      var fetchPromises = keys.map(function (key) {
        var viewOpts = {
          startkey : toIndexableString([key]),
          endkey   : toIndexableString([key, {}])
        };
        return fetchFromView(viewOpts);
      });
      return Promise.all(fetchPromises).then(flatten).then(onMapResultsReady);
    } else { // normal query, no 'keys'
      var viewOpts = {
        descending : opts.descending
      };
      if (typeof opts.startkey !== 'undefined') {
        viewOpts.startkey = opts.descending ?
          toIndexableString([opts.startkey, {}]) :
          toIndexableString([opts.startkey]);
      }
      if (typeof opts.endkey !== 'undefined') {
        var inclusiveEnd = opts.inclusive_end !== false;
        if (opts.descending) {
          inclusiveEnd = !inclusiveEnd;
        }
  
        viewOpts.endkey = toIndexableString(inclusiveEnd ? [opts.endkey, {}] : [opts.endkey]);
      }
      if (typeof opts.key !== 'undefined') {
        var keyStart = toIndexableString([opts.key]);
        var keyEnd = toIndexableString([opts.key, {}]);
        if (viewOpts.descending) {
          viewOpts.endkey = keyStart;
          viewOpts.startkey = keyEnd;
        } else {
          viewOpts.startkey = keyStart;
          viewOpts.endkey = keyEnd;
        }
      }
      if (!shouldReduce) {
        if (typeof opts.limit === 'number') {
          viewOpts.limit = opts.limit;
        }
        viewOpts.skip = skip;
      }
      return fetchFromView(viewOpts).then(onMapResultsReady);
    }
  }
  
  function httpViewCleanup(db) {
    return db.request({
      method: 'POST',
      url: '_view_cleanup'
    });
  }
  
  function localViewCleanup(db) {
    return db.get('_local/mrviews').then(function (metaDoc) {
      var docsToViews = {};
      Object.keys(metaDoc.views).forEach(function (fullViewName) {
        var parts = parseViewName(fullViewName);
        var designDocName = '_design/' + parts[0];
        var viewName = parts[1];
        docsToViews[designDocName] = docsToViews[designDocName] || {};
        docsToViews[designDocName][viewName] = true;
      });
      var opts = {
        keys : Object.keys(docsToViews),
        include_docs : true
      };
      return db.allDocs(opts).then(function (res) {
        var viewsToStatus = {};
        res.rows.forEach(function (row) {
          var ddocName = row.key.substring(8);
          Object.keys(docsToViews[row.key]).forEach(function (viewName) {
            var fullViewName = ddocName + '/' + viewName;
            /* istanbul ignore if */
            if (!metaDoc.views[fullViewName]) {
              // new format, without slashes, to support PouchDB 2.2.0
              // migration test in pouchdb's browser.migration.js verifies this
              fullViewName = viewName;
            }
            var viewDBNames = Object.keys(metaDoc.views[fullViewName]);
            // design doc deleted, or view function nonexistent
            var statusIsGood = row.doc && row.doc.views && row.doc.views[viewName];
            viewDBNames.forEach(function (viewDBName) {
              viewsToStatus[viewDBName] = viewsToStatus[viewDBName] || statusIsGood;
            });
          });
        });
        var dbsToDelete = Object.keys(viewsToStatus).filter(function (viewDBName) {
          return !viewsToStatus[viewDBName];
        });
        var destroyPromises = dbsToDelete.map(function (viewDBName) {
          return utils.sequentialize(getQueue(viewDBName), function () {
            return new db.constructor(viewDBName, db.__opts).destroy();
          })();
        });
        return Promise.all(destroyPromises).then(function () {
          return {ok: true};
        });
      });
    }, defaultsTo({ok: true}));
  }
  
  exports.viewCleanup = utils.callbackify(function () {
    var db = this;
    if (db.type() === 'http') {
      return httpViewCleanup(db);
    }
    return localViewCleanup(db);
  });
  
  function queryPromised(db, fun, opts) {
    if (db.type() === 'http') {
      return httpQuery(db, fun, opts);
    }
  
    if (typeof fun !== 'string') {
      // temp_view
      checkQueryParseError(opts, fun);
  
      var createViewOpts = {
        db : db,
        viewName : 'temp_view/temp_view',
        map : fun.map,
        reduce : fun.reduce,
        temporary : true
      };
      tempViewQueue.add(function () {
        return createView(createViewOpts).then(function (view) {
          function cleanup() {
            return view.db.destroy();
          }
          return utils.fin(updateView(view).then(function () {
            return queryView(view, opts);
          }), cleanup);
        });
      });
      return tempViewQueue.finish();
    } else {
      // persistent view
      var fullViewName = fun;
      var parts = parseViewName(fullViewName);
      var designDocName = parts[0];
      var viewName = parts[1];
      return db.get('_design/' + designDocName).then(function (doc) {
        var fun = doc.views && doc.views[viewName];
  
        if (!fun || typeof fun.map !== 'string') {
          throw new NotFoundError('ddoc ' + designDocName + ' has no view named ' +
            viewName);
        }
        checkQueryParseError(opts, fun);
  
        var createViewOpts = {
          db : db,
          viewName : fullViewName,
          map : fun.map,
          reduce : fun.reduce
        };
        return createView(createViewOpts).then(function (view) {
          if (opts.stale === 'ok' || opts.stale === 'update_after') {
            if (opts.stale === 'update_after') {
              process.nextTick(function () {
                updateView(view);
              });
            }
            return queryView(view, opts);
          } else { // stale not ok
            return updateView(view).then(function () {
              return queryView(view, opts);
            });
          }
        });
      });
    }
  }
  
  exports.query = function (fun, opts, callback) {
    if (typeof opts === 'function') {
      callback = opts;
      opts = {};
    }
    opts = utils.extend(true, {}, opts);
  
    if (typeof fun === 'function') {
      fun = {map : fun};
    }
  
    var db = this;
    var promise = Promise.resolve().then(function () {
      return queryPromised(db, fun, opts);
    });
    utils.promisedCallback(promise, callback);
    return promise;
  };
  
  function QueryParseError(message) {
    this.status = 400;
    this.name = 'query_parse_error';
    this.message = message;
    this.error = true;
    try {
      Error.captureStackTrace(this, QueryParseError);
    } catch (e) {}
  }
  
  utils.inherits(QueryParseError, Error);
  
  function NotFoundError(message) {
    this.status = 404;
    this.name = 'not_found';
    this.message = message;
    this.error = true;
    try {
      Error.captureStackTrace(this, NotFoundError);
    } catch (e) {}
  }
  
  utils.inherits(NotFoundError, Error);
  
  function BuiltInError(message) {
    this.status = 500;
    this.name = 'invalid_value';
    this.message = message;
    this.error = true;
    try {
      Error.captureStackTrace(this, BuiltInError);
    } catch (e) {}
  }
  
  utils.inherits(BuiltInError, Error);
  }).call(this,_dereq_(41))
  },{"41":41,"64":64,"68":68,"69":69,"71":71,"73":73}],71:[function(_dereq_,module,exports){
  'use strict';
  /*
   * Simple task queue to sequentialize actions. Assumes callbacks will eventually fire (once).
   */
  
  var Promise = _dereq_(73).Promise;
  
  function TaskQueue() {
    this.promise = new Promise(function (fulfill) {fulfill(); });
  }
  TaskQueue.prototype.add = function (promiseFactory) {
    this.promise = this.promise["catch"](function () {
      // just recover
    }).then(function () {
      return promiseFactory();
    });
    return this.promise;
  };
  TaskQueue.prototype.finish = function () {
    return this.promise;
  };
  
  module.exports = TaskQueue;
  
  },{"73":73}],72:[function(_dereq_,module,exports){
  'use strict';
  
  var upsert = _dereq_(74).upsert;
  
  module.exports = function (db, doc, diffFun) {
    return upsert.apply(db, [doc, diffFun]);
  };
  },{"74":74}],73:[function(_dereq_,module,exports){
  (function (process,global){
  'use strict';
  /* istanbul ignore if */
  if (typeof global.Promise === 'function') {
    exports.Promise = global.Promise;
  } else {
    exports.Promise = _dereq_(49);
  }
  
  exports.inherits = _dereq_(45);
  exports.extend = _dereq_(67);
  var argsarray = _dereq_(38);
  
  exports.promisedCallback = function (promise, callback) {
    if (callback) {
      promise.then(function (res) {
        process.nextTick(function () {
          callback(null, res);
        });
      }, function (reason) {
        process.nextTick(function () {
          callback(reason);
        });
      });
    }
    return promise;
  };
  
  exports.callbackify = function (fun) {
    return argsarray(function (args) {
      var cb = args.pop();
      var promise = fun.apply(this, args);
      if (typeof cb === 'function') {
        exports.promisedCallback(promise, cb);
      }
      return promise;
    });
  };
  
  // Promise finally util similar to Q.finally
  exports.fin = function (promise, cb) {
    return promise.then(function (res) {
      var promise2 = cb();
      if (typeof promise2.then === 'function') {
        return promise2.then(function () {
          return res;
        });
      }
      return res;
    }, function (reason) {
      var promise2 = cb();
      if (typeof promise2.then === 'function') {
        return promise2.then(function () {
          throw reason;
        });
      }
      throw reason;
    });
  };
  
  exports.sequentialize = function (queue, promiseFactory) {
    return function () {
      var args = arguments;
      var that = this;
      return queue.add(function () {
        return promiseFactory.apply(that, args);
      });
    };
  };
  
  exports.flatten = function (arrs) {
    var res = [];
    for (var i = 0, len = arrs.length; i < len; i++) {
      res = res.concat(arrs[i]);
    }
    return res;
  };
  
  // uniq an array of strings, order not guaranteed
  // similar to underscore/lodash _.uniq
  exports.uniq = function (arr) {
    var map = {};
  
    for (var i = 0, len = arr.length; i < len; i++) {
      map['$' + arr[i]] = true;
    }
  
    var keys = Object.keys(map);
    var output = new Array(keys.length);
  
    for (i = 0, len = keys.length; i < len; i++) {
      output[i] = keys[i].substring(1);
    }
    return output;
  };
  
  var crypto = _dereq_(39);
  var Md5 = _dereq_(75);
  
  exports.MD5 = function (string) {
    /* istanbul ignore else */
    if (!process.browser) {
      return crypto.createHash('md5').update(string).digest('hex');
    } else {
      return Md5.hash(string);
    }
  };
  }).call(this,_dereq_(41),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"38":38,"39":39,"41":41,"45":45,"49":49,"67":67,"75":75}],74:[function(_dereq_,module,exports){
  (function (global){
  'use strict';
  
  var PouchPromise;
  /* istanbul ignore next */
  if (typeof window !== 'undefined' && window.PouchDB) {
    PouchPromise = window.PouchDB.utils.Promise;
  } else {
    PouchPromise = typeof global.Promise === 'function' ? global.Promise : _dereq_(49);
  }
  
  // this is essentially the "update sugar" function from daleharvey/pouchdb#1388
  // the diffFun tells us what delta to apply to the doc.  it either returns
  // the doc, or false if it doesn't need to do an update after all
  function upsertInner(db, docId, diffFun) {
    return new PouchPromise(function (fulfill, reject) {
      if (typeof docId !== 'string') {
        return reject(new Error('doc id is required'));
      }
  
      db.get(docId, function (err, doc) {
        if (err) {
          /* istanbul ignore next */
          if (err.status !== 404) {
            return reject(err);
          }
          doc = {};
        }
  
        // the user might change the _rev, so save it for posterity
        var docRev = doc._rev;
        var newDoc = diffFun(doc);
  
        if (!newDoc) {
          // if the diffFun returns falsy, we short-circuit as
          // an optimization
          return fulfill({updated: false, rev: docRev});
        }
  
        // users aren't allowed to modify these values,
        // so reset them here
        newDoc._id = docId;
        newDoc._rev = docRev;
        fulfill(tryAndPut(db, newDoc, diffFun));
      });
    });
  }
  
  function tryAndPut(db, doc, diffFun) {
    return db.put(doc).then(function (res) {
      return {
        updated: true,
        rev: res.rev
      };
    }, function (err) {
      /* istanbul ignore next */
      if (err.status !== 409) {
        throw err;
      }
      return upsertInner(db, doc._id, diffFun);
    });
  }
  
  exports.upsert = function upsert(docId, diffFun, cb) {
    var db = this;
    var promise = upsertInner(db, docId, diffFun);
    if (typeof cb !== 'function') {
      return promise;
    }
    promise.then(function (resp) {
      cb(null, resp);
    }, cb);
  };
  
  exports.putIfNotExists = function putIfNotExists(docId, doc, cb) {
    var db = this;
  
    if (typeof docId !== 'string') {
      cb = doc;
      doc = docId;
      docId = doc._id;
    }
  
    var diffFun = function (existingDoc) {
      if (existingDoc._rev) {
        return false; // do nothing
      }
      return doc;
    };
  
    var promise = upsertInner(db, docId, diffFun);
    if (typeof cb !== 'function') {
      return promise;
    }
    promise.then(function (resp) {
      cb(null, resp);
    }, cb);
  };
  
  
  /* istanbul ignore next */
  if (typeof window !== 'undefined' && window.PouchDB) {
    window.PouchDB.plugin(exports);
  }
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"49":49}],75:[function(_dereq_,module,exports){
  /*jshint bitwise:false*/
  /*global unescape*/
  
  (function (factory) {
      if (typeof exports === 'object') {
          // Node/CommonJS
          module.exports = factory();
      } else if (typeof define === 'function' && define.amd) {
          // AMD
          define(factory);
      } else {
          // Browser globals (with support for web workers)
          var glob;
          try {
              glob = window;
          } catch (e) {
              glob = self;
          }
  
          glob.SparkMD5 = factory();
      }
  }(function (undefined) {
  
      'use strict';
  
      ////////////////////////////////////////////////////////////////////////////
  
      /*
       * Fastest md5 implementation around (JKM md5)
       * Credits: Joseph Myers
       *
       * @see http://www.myersdaily.org/joseph/javascript/md5-text.html
       * @see http://jsperf.com/md5-shootout/7
       */
  
      /* this function is much faster,
        so if possible we use it. Some IEs
        are the only ones I know of that
        need the idiotic second function,
        generated by an if clause.  */
      var add32 = function (a, b) {
          return (a + b) & 0xFFFFFFFF;
      },
  
      cmn = function (q, a, b, x, s, t) {
          a = add32(add32(a, q), add32(x, t));
          return add32((a << s) | (a >>> (32 - s)), b);
      },
  
      ff = function (a, b, c, d, x, s, t) {
          return cmn((b & c) | ((~b) & d), a, b, x, s, t);
      },
  
      gg = function (a, b, c, d, x, s, t) {
          return cmn((b & d) | (c & (~d)), a, b, x, s, t);
      },
  
      hh = function (a, b, c, d, x, s, t) {
          return cmn(b ^ c ^ d, a, b, x, s, t);
      },
  
      ii = function (a, b, c, d, x, s, t) {
          return cmn(c ^ (b | (~d)), a, b, x, s, t);
      },
  
      md5cycle = function (x, k) {
          var a = x[0],
              b = x[1],
              c = x[2],
              d = x[3];
  
          a = ff(a, b, c, d, k[0], 7, -680876936);
          d = ff(d, a, b, c, k[1], 12, -389564586);
          c = ff(c, d, a, b, k[2], 17, 606105819);
          b = ff(b, c, d, a, k[3], 22, -1044525330);
          a = ff(a, b, c, d, k[4], 7, -176418897);
          d = ff(d, a, b, c, k[5], 12, 1200080426);
          c = ff(c, d, a, b, k[6], 17, -1473231341);
          b = ff(b, c, d, a, k[7], 22, -45705983);
          a = ff(a, b, c, d, k[8], 7, 1770035416);
          d = ff(d, a, b, c, k[9], 12, -1958414417);
          c = ff(c, d, a, b, k[10], 17, -42063);
          b = ff(b, c, d, a, k[11], 22, -1990404162);
          a = ff(a, b, c, d, k[12], 7, 1804603682);
          d = ff(d, a, b, c, k[13], 12, -40341101);
          c = ff(c, d, a, b, k[14], 17, -1502002290);
          b = ff(b, c, d, a, k[15], 22, 1236535329);
  
          a = gg(a, b, c, d, k[1], 5, -165796510);
          d = gg(d, a, b, c, k[6], 9, -1069501632);
          c = gg(c, d, a, b, k[11], 14, 643717713);
          b = gg(b, c, d, a, k[0], 20, -373897302);
          a = gg(a, b, c, d, k[5], 5, -701558691);
          d = gg(d, a, b, c, k[10], 9, 38016083);
          c = gg(c, d, a, b, k[15], 14, -660478335);
          b = gg(b, c, d, a, k[4], 20, -405537848);
          a = gg(a, b, c, d, k[9], 5, 568446438);
          d = gg(d, a, b, c, k[14], 9, -1019803690);
          c = gg(c, d, a, b, k[3], 14, -187363961);
          b = gg(b, c, d, a, k[8], 20, 1163531501);
          a = gg(a, b, c, d, k[13], 5, -1444681467);
          d = gg(d, a, b, c, k[2], 9, -51403784);
          c = gg(c, d, a, b, k[7], 14, 1735328473);
          b = gg(b, c, d, a, k[12], 20, -1926607734);
  
          a = hh(a, b, c, d, k[5], 4, -378558);
          d = hh(d, a, b, c, k[8], 11, -2022574463);
          c = hh(c, d, a, b, k[11], 16, 1839030562);
          b = hh(b, c, d, a, k[14], 23, -35309556);
          a = hh(a, b, c, d, k[1], 4, -1530992060);
          d = hh(d, a, b, c, k[4], 11, 1272893353);
          c = hh(c, d, a, b, k[7], 16, -155497632);
          b = hh(b, c, d, a, k[10], 23, -1094730640);
          a = hh(a, b, c, d, k[13], 4, 681279174);
          d = hh(d, a, b, c, k[0], 11, -358537222);
          c = hh(c, d, a, b, k[3], 16, -722521979);
          b = hh(b, c, d, a, k[6], 23, 76029189);
          a = hh(a, b, c, d, k[9], 4, -640364487);
          d = hh(d, a, b, c, k[12], 11, -421815835);
          c = hh(c, d, a, b, k[15], 16, 530742520);
          b = hh(b, c, d, a, k[2], 23, -995338651);
  
          a = ii(a, b, c, d, k[0], 6, -198630844);
          d = ii(d, a, b, c, k[7], 10, 1126891415);
          c = ii(c, d, a, b, k[14], 15, -1416354905);
          b = ii(b, c, d, a, k[5], 21, -57434055);
          a = ii(a, b, c, d, k[12], 6, 1700485571);
          d = ii(d, a, b, c, k[3], 10, -1894986606);
          c = ii(c, d, a, b, k[10], 15, -1051523);
          b = ii(b, c, d, a, k[1], 21, -2054922799);
          a = ii(a, b, c, d, k[8], 6, 1873313359);
          d = ii(d, a, b, c, k[15], 10, -30611744);
          c = ii(c, d, a, b, k[6], 15, -1560198380);
          b = ii(b, c, d, a, k[13], 21, 1309151649);
          a = ii(a, b, c, d, k[4], 6, -145523070);
          d = ii(d, a, b, c, k[11], 10, -1120210379);
          c = ii(c, d, a, b, k[2], 15, 718787259);
          b = ii(b, c, d, a, k[9], 21, -343485551);
  
          x[0] = add32(a, x[0]);
          x[1] = add32(b, x[1]);
          x[2] = add32(c, x[2]);
          x[3] = add32(d, x[3]);
      },
  
      /* there needs to be support for Unicode here,
         * unless we pretend that we can redefine the MD-5
         * algorithm for multi-byte characters (perhaps
         * by adding every four 16-bit characters and
         * shortening the sum to 32 bits). Otherwise
         * I suggest performing MD-5 as if every character
         * was two bytes--e.g., 0040 0025 = @%--but then
         * how will an ordinary MD-5 sum be matched?
         * There is no way to standardize text to something
         * like UTF-8 before transformation; speed cost is
         * utterly prohibitive. The JavaScript standard
         * itself needs to look at this: it should start
         * providing access to strings as preformed UTF-8
         * 8-bit unsigned value arrays.
         */
      md5blk = function (s) {
          var md5blks = [],
              i; /* Andy King said do it this way. */
  
          for (i = 0; i < 64; i += 4) {
              md5blks[i >> 2] = s.charCodeAt(i) + (s.charCodeAt(i + 1) << 8) + (s.charCodeAt(i + 2) << 16) + (s.charCodeAt(i + 3) << 24);
          }
          return md5blks;
      },
  
      md5blk_array = function (a) {
          var md5blks = [],
              i; /* Andy King said do it this way. */
  
          for (i = 0; i < 64; i += 4) {
              md5blks[i >> 2] = a[i] + (a[i + 1] << 8) + (a[i + 2] << 16) + (a[i + 3] << 24);
          }
          return md5blks;
      },
  
      md51 = function (s) {
          var n = s.length,
              state = [1732584193, -271733879, -1732584194, 271733878],
              i,
              length,
              tail,
              tmp,
              lo,
              hi;
  
          for (i = 64; i <= n; i += 64) {
              md5cycle(state, md5blk(s.substring(i - 64, i)));
          }
          s = s.substring(i - 64);
          length = s.length;
          tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
          for (i = 0; i < length; i += 1) {
              tail[i >> 2] |= s.charCodeAt(i) << ((i % 4) << 3);
          }
          tail[i >> 2] |= 0x80 << ((i % 4) << 3);
          if (i > 55) {
              md5cycle(state, tail);
              for (i = 0; i < 16; i += 1) {
                  tail[i] = 0;
              }
          }
  
          // Beware that the final length might not fit in 32 bits so we take care of that
          tmp = n * 8;
          tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/);
          lo = parseInt(tmp[2], 16);
          hi = parseInt(tmp[1], 16) || 0;
  
          tail[14] = lo;
          tail[15] = hi;
  
          md5cycle(state, tail);
          return state;
      },
  
      md51_array = function (a) {
          var n = a.length,
              state = [1732584193, -271733879, -1732584194, 271733878],
              i,
              length,
              tail,
              tmp,
              lo,
              hi;
  
          for (i = 64; i <= n; i += 64) {
              md5cycle(state, md5blk_array(a.subarray(i - 64, i)));
          }
  
          // Not sure if it is a bug, however IE10 will always produce a sub array of length 1
          // containing the last element of the parent array if the sub array specified starts
          // beyond the length of the parent array - weird.
          // https://connect.microsoft.com/IE/feedback/details/771452/typed-array-subarray-issue
          a = (i - 64) < n ? a.subarray(i - 64) : new Uint8Array(0);
  
          length = a.length;
          tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
          for (i = 0; i < length; i += 1) {
              tail[i >> 2] |= a[i] << ((i % 4) << 3);
          }
  
          tail[i >> 2] |= 0x80 << ((i % 4) << 3);
          if (i > 55) {
              md5cycle(state, tail);
              for (i = 0; i < 16; i += 1) {
                  tail[i] = 0;
              }
          }
  
          // Beware that the final length might not fit in 32 bits so we take care of that
          tmp = n * 8;
          tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/);
          lo = parseInt(tmp[2], 16);
          hi = parseInt(tmp[1], 16) || 0;
  
          tail[14] = lo;
          tail[15] = hi;
  
          md5cycle(state, tail);
  
          return state;
      },
  
      hex_chr = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'],
  
      rhex = function (n) {
          var s = '',
              j;
          for (j = 0; j < 4; j += 1) {
              s += hex_chr[(n >> (j * 8 + 4)) & 0x0F] + hex_chr[(n >> (j * 8)) & 0x0F];
          }
          return s;
      },
  
      hex = function (x) {
          var i;
          for (i = 0; i < x.length; i += 1) {
              x[i] = rhex(x[i]);
          }
          return x.join('');
      },
  
      md5 = function (s) {
          return hex(md51(s));
      },
  
  
  
      ////////////////////////////////////////////////////////////////////////////
  
      /**
       * SparkMD5 OOP implementation.
       *
       * Use this class to perform an incremental md5, otherwise use the
       * static methods instead.
       */
      SparkMD5 = function () {
          // call reset to init the instance
          this.reset();
      };
  
  
      // In some cases the fast add32 function cannot be used..
      if (md5('hello') !== '5d41402abc4b2a76b9719d911017c592') {
          add32 = function (x, y) {
              var lsw = (x & 0xFFFF) + (y & 0xFFFF),
                  msw = (x >> 16) + (y >> 16) + (lsw >> 16);
              return (msw << 16) | (lsw & 0xFFFF);
          };
      }
  
  
      /**
       * Appends a string.
       * A conversion will be applied if an utf8 string is detected.
       *
       * @param {String} str The string to be appended
       *
       * @return {SparkMD5} The instance itself
       */
      SparkMD5.prototype.append = function (str) {
          // converts the string to utf8 bytes if necessary
          if (/[\u0080-\uFFFF]/.test(str)) {
              str = unescape(encodeURIComponent(str));
          }
  
          // then append as binary
          this.appendBinary(str);
  
          return this;
      };
  
      /**
       * Appends a binary string.
       *
       * @param {String} contents The binary string to be appended
       *
       * @return {SparkMD5} The instance itself
       */
      SparkMD5.prototype.appendBinary = function (contents) {
          this._buff += contents;
          this._length += contents.length;
  
          var length = this._buff.length,
              i;
  
          for (i = 64; i <= length; i += 64) {
              md5cycle(this._state, md5blk(this._buff.substring(i - 64, i)));
          }
  
          this._buff = this._buff.substr(i - 64);
  
          return this;
      };
  
      /**
       * Finishes the incremental computation, reseting the internal state and
       * returning the result.
       * Use the raw parameter to obtain the raw result instead of the hex one.
       *
       * @param {Boolean} raw True to get the raw result, false to get the hex result
       *
       * @return {String|Array} The result
       */
      SparkMD5.prototype.end = function (raw) {
          var buff = this._buff,
              length = buff.length,
              i,
              tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
              ret;
  
          for (i = 0; i < length; i += 1) {
              tail[i >> 2] |= buff.charCodeAt(i) << ((i % 4) << 3);
          }
  
          this._finish(tail, length);
          ret = !!raw ? this._state : hex(this._state);
  
          this.reset();
  
          return ret;
      };
  
      /**
       * Finish the final calculation based on the tail.
       *
       * @param {Array}  tail   The tail (will be modified)
       * @param {Number} length The length of the remaining buffer
       */
      SparkMD5.prototype._finish = function (tail, length) {
          var i = length,
              tmp,
              lo,
              hi;
  
          tail[i >> 2] |= 0x80 << ((i % 4) << 3);
          if (i > 55) {
              md5cycle(this._state, tail);
              for (i = 0; i < 16; i += 1) {
                  tail[i] = 0;
              }
          }
  
          // Do the final computation based on the tail and length
          // Beware that the final length may not fit in 32 bits so we take care of that
          tmp = this._length * 8;
          tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/);
          lo = parseInt(tmp[2], 16);
          hi = parseInt(tmp[1], 16) || 0;
  
          tail[14] = lo;
          tail[15] = hi;
          md5cycle(this._state, tail);
      };
  
      /**
       * Resets the internal state of the computation.
       *
       * @return {SparkMD5} The instance itself
       */
      SparkMD5.prototype.reset = function () {
          this._buff = "";
          this._length = 0;
          this._state = [1732584193, -271733879, -1732584194, 271733878];
  
          return this;
      };
  
      /**
       * Releases memory used by the incremental buffer and other aditional
       * resources. If you plan to use the instance again, use reset instead.
       */
      SparkMD5.prototype.destroy = function () {
          delete this._state;
          delete this._buff;
          delete this._length;
      };
  
  
      /**
       * Performs the md5 hash on a string.
       * A conversion will be applied if utf8 string is detected.
       *
       * @param {String}  str The string
       * @param {Boolean} raw True to get the raw result, false to get the hex result
       *
       * @return {String|Array} The result
       */
      SparkMD5.hash = function (str, raw) {
          // converts the string to utf8 bytes if necessary
          if (/[\u0080-\uFFFF]/.test(str)) {
              str = unescape(encodeURIComponent(str));
          }
  
          var hash = md51(str);
  
          return !!raw ? hash : hex(hash);
      };
  
      /**
       * Performs the md5 hash on a binary string.
       *
       * @param {String}  content The binary string
       * @param {Boolean} raw     True to get the raw result, false to get the hex result
       *
       * @return {String|Array} The result
       */
      SparkMD5.hashBinary = function (content, raw) {
          var hash = md51(content);
  
          return !!raw ? hash : hex(hash);
      };
  
      /**
       * SparkMD5 OOP implementation for array buffers.
       *
       * Use this class to perform an incremental md5 ONLY for array buffers.
       */
      SparkMD5.ArrayBuffer = function () {
          // call reset to init the instance
          this.reset();
      };
  
      ////////////////////////////////////////////////////////////////////////////
  
      /**
       * Appends an array buffer.
       *
       * @param {ArrayBuffer} arr The array to be appended
       *
       * @return {SparkMD5.ArrayBuffer} The instance itself
       */
      SparkMD5.ArrayBuffer.prototype.append = function (arr) {
          // TODO: we could avoid the concatenation here but the algorithm would be more complex
          //       if you find yourself needing extra performance, please make a PR.
          var buff = this._concatArrayBuffer(this._buff, arr),
              length = buff.length,
              i;
  
          this._length += arr.byteLength;
  
          for (i = 64; i <= length; i += 64) {
              md5cycle(this._state, md5blk_array(buff.subarray(i - 64, i)));
          }
  
          // Avoids IE10 weirdness (documented above)
          this._buff = (i - 64) < length ? buff.subarray(i - 64) : new Uint8Array(0);
  
          return this;
      };
  
      /**
       * Finishes the incremental computation, reseting the internal state and
       * returning the result.
       * Use the raw parameter to obtain the raw result instead of the hex one.
       *
       * @param {Boolean} raw True to get the raw result, false to get the hex result
       *
       * @return {String|Array} The result
       */
      SparkMD5.ArrayBuffer.prototype.end = function (raw) {
          var buff = this._buff,
              length = buff.length,
              tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
              i,
              ret;
  
          for (i = 0; i < length; i += 1) {
              tail[i >> 2] |= buff[i] << ((i % 4) << 3);
          }
  
          this._finish(tail, length);
          ret = !!raw ? this._state : hex(this._state);
  
          this.reset();
  
          return ret;
      };
  
      SparkMD5.ArrayBuffer.prototype._finish = SparkMD5.prototype._finish;
  
      /**
       * Resets the internal state of the computation.
       *
       * @return {SparkMD5.ArrayBuffer} The instance itself
       */
      SparkMD5.ArrayBuffer.prototype.reset = function () {
          this._buff = new Uint8Array(0);
          this._length = 0;
          this._state = [1732584193, -271733879, -1732584194, 271733878];
  
          return this;
      };
  
      /**
       * Releases memory used by the incremental buffer and other aditional
       * resources. If you plan to use the instance again, use reset instead.
       */
      SparkMD5.ArrayBuffer.prototype.destroy = SparkMD5.prototype.destroy;
  
      /**
       * Concats two array buffers, returning a new one.
       *
       * @param  {ArrayBuffer} first  The first array buffer
       * @param  {ArrayBuffer} second The second array buffer
       *
       * @return {ArrayBuffer} The new array buffer
       */
      SparkMD5.ArrayBuffer.prototype._concatArrayBuffer = function (first, second) {
          var firstLength = first.length,
              result = new Uint8Array(firstLength + second.byteLength);
  
          result.set(first);
          result.set(new Uint8Array(second), firstLength);
  
          return result;
      };
  
      /**
       * Performs the md5 hash on an array buffer.
       *
       * @param {ArrayBuffer} arr The array buffer
       * @param {Boolean}     raw True to get the raw result, false to get the hex result
       *
       * @return {String|Array} The result
       */
      SparkMD5.ArrayBuffer.hash = function (arr, raw) {
          var hash = md51_array(new Uint8Array(arr));
  
          return !!raw ? hash : hex(hash);
      };
  
      return SparkMD5;
  }));
  
  },{}],76:[function(_dereq_,module,exports){
  'use strict';
  
  /**
   * Stringify/parse functions that don't operate
   * recursively, so they avoid call stack exceeded
   * errors.
   */
  exports.stringify = function stringify(input) {
    var queue = [];
    queue.push({obj: input});
  
    var res = '';
    var next, obj, prefix, val, i, arrayPrefix, keys, k, key, value, objPrefix;
    while ((next = queue.pop())) {
      obj = next.obj;
      prefix = next.prefix || '';
      val = next.val || '';
      res += prefix;
      if (val) {
        res += val;
      } else if (typeof obj !== 'object') {
        res += typeof obj === 'undefined' ? null : JSON.stringify(obj);
      } else if (obj === null) {
        res += 'null';
      } else if (Array.isArray(obj)) {
        queue.push({val: ']'});
        for (i = obj.length - 1; i >= 0; i--) {
          arrayPrefix = i === 0 ? '' : ',';
          queue.push({obj: obj[i], prefix: arrayPrefix});
        }
        queue.push({val: '['});
      } else { // object
        keys = [];
        for (k in obj) {
          if (obj.hasOwnProperty(k)) {
            keys.push(k);
          }
        }
        queue.push({val: '}'});
        for (i = keys.length - 1; i >= 0; i--) {
          key = keys[i];
          value = obj[key];
          objPrefix = (i > 0 ? ',' : '');
          objPrefix += JSON.stringify(key) + ':';
          queue.push({obj: value, prefix: objPrefix});
        }
        queue.push({val: '{'});
      }
    }
    return res;
  };
  
  // Convenience function for the parse function.
  // This pop function is basically copied from
  // pouchCollate.parseIndexableString
  function pop(obj, stack, metaStack) {
    var lastMetaElement = metaStack[metaStack.length - 1];
    if (obj === lastMetaElement.element) {
      // popping a meta-element, e.g. an object whose value is another object
      metaStack.pop();
      lastMetaElement = metaStack[metaStack.length - 1];
    }
    var element = lastMetaElement.element;
    var lastElementIndex = lastMetaElement.index;
    if (Array.isArray(element)) {
      element.push(obj);
    } else if (lastElementIndex === stack.length - 2) { // obj with key+value
      var key = stack.pop();
      element[key] = obj;
    } else {
      stack.push(obj); // obj with key only
    }
  }
  
  exports.parse = function (str) {
    var stack = [];
    var metaStack = []; // stack for arrays and objects
    var i = 0;
    var collationIndex,parsedNum,numChar;
    var parsedString,lastCh,numConsecutiveSlashes,ch;
    var arrayElement, objElement;
    while (true) {
      collationIndex = str[i++];
      if (collationIndex === '}' ||
          collationIndex === ']' ||
          typeof collationIndex === 'undefined') {
        if (stack.length === 1) {
          return stack.pop();
        } else {
          pop(stack.pop(), stack, metaStack);
          continue;
        }
      }
      switch (collationIndex) {
        case ' ':
        case '\t':
        case '\n':
        case ':':
        case ',':
          break;
        case 'n':
          i += 3; // 'ull'
          pop(null, stack, metaStack);
          break;
        case 't':
          i += 3; // 'rue'
          pop(true, stack, metaStack);
          break;
        case 'f':
          i += 4; // 'alse'
          pop(false, stack, metaStack);
          break;
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
        case '-':
          parsedNum = '';
          i--;
          while (true) {
            numChar = str[i++];
            if (/[\d\.\-e\+]/.test(numChar)) {
              parsedNum += numChar;
            } else {
              i--;
              break;
            }
          }
          pop(parseFloat(parsedNum), stack, metaStack);
          break;
        case '"':
          parsedString = '';
          lastCh = void 0;
          numConsecutiveSlashes = 0;
          while (true) {
            ch = str[i++];
            if (ch !== '"' || (lastCh === '\\' &&
                numConsecutiveSlashes % 2 === 1)) {
              parsedString += ch;
              lastCh = ch;
              if (lastCh === '\\') {
                numConsecutiveSlashes++;
              } else {
                numConsecutiveSlashes = 0;
              }
            } else {
              break;
            }
          }
          pop(JSON.parse('"' + parsedString + '"'), stack, metaStack);
          break;
        case '[':
          arrayElement = { element: [], index: stack.length };
          stack.push(arrayElement.element);
          metaStack.push(arrayElement);
          break;
        case '{':
          objElement = { element: {}, index: stack.length };
          stack.push(objElement.element);
          metaStack.push(objElement);
          break;
        default:
          throw new Error(
            'unexpectedly reached end of input: ' + collationIndex);
      }
    }
  };
  
  },{}],77:[function(_dereq_,module,exports){
  (function (process){
  "use strict";
  
  var PouchDB = _dereq_(33);
  
  module.exports = PouchDB;
  
  PouchDB.ajax = _dereq_(16);
  PouchDB.utils = _dereq_(36);
  PouchDB.Errors = _dereq_(19);
  PouchDB.replicate = _dereq_(32).replicate;
  PouchDB.sync = _dereq_(34);
  PouchDB.version = _dereq_(37);
  var httpAdapter = _dereq_(2);
  PouchDB.adapter('http', httpAdapter);
  PouchDB.adapter('https', httpAdapter);
  
  PouchDB.adapter('idb', _dereq_(8), true);
  PouchDB.adapter('websql', _dereq_(12), true);
  PouchDB.plugin(_dereq_(70));
  
  if (!process.browser) {
    var ldbAdapter = _dereq_(39);
    PouchDB.adapter('leveldb', ldbAdapter, true);
  }
  
  }).call(this,_dereq_(41))
  },{"12":12,"16":16,"19":19,"2":2,"32":32,"33":33,"34":34,"36":36,"37":37,"39":39,"41":41,"70":70,"8":8}]},{},[77])(77)
  });
  