text: /*!
   * Postman BDD v2.1.0 (March 5th 2017)
   *
   * https://bigstickcarpet.github.io/postman-bdd
   *
   * @author  James Messinger (http://bigstickcarpet.com)
   * @license MIT
   */
  (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.postmanBDD = 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(require,module,exports){
  'use strict';
  
  var isIP = require('is-ip');
  var url = require('url');
  var cookies = require('./cookies');
  
  var contentTypes = {
    json: 'application/json',
    text: 'text/plain',
    html: 'text/html',
  };
  
  module.exports = chaiHttp;
  
  /**
   * This module is based on chai-http
   * https://github.com/chaijs/chai-http
   *
   * Copyright(c) 2011-2012 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  function chaiHttp (chai) {
    var Assertion = chai.Assertion;
  
    /**
     * Assert that a response has a supplied status.
     *
     * @example
     * expect(res).to.have.status(200);
     *
     * @param {Number} status number
     * @name status
     */
    Assertion.addMethod('status', function (code) {
      new Assertion(this._obj).to.have.property('status');
      var status = this._obj.status;
  
      this.assert(
        status === code,
        'expected the response to have status code #{exp} but got #{act}',
        'expected the response to not have status code #{act}',
        code,
        status
      );
    });
  
    /**
     * Assert that a `Response` or `Request` object has headers.
     *
     * @example:
     * expect(req).to.have.headers;
     *
     * @name headers
     */
    Assertion.addProperty('headers', function () {
      var type = this._obj.method ? 'request' : 'response';
  
      this.assert(
        Object.keys(this._obj.headers || {}).length > 0,
        'expected the ' + type + ' to have headers',
        'expected the ' + type + ' to not have any headers'
      );
    });
  
    /**
     * Assert that a `Response` or `Request` object has a header.
     * If a value is provided, equality to value will be asserted.
     * You may also pass a regular expression to check.
     *
     * @example:
     * expect(req).to.have.header('x-api-key');
     * expect(req).to.have.header('content-type', 'text/plain');
     * expect(req).to.have.header('content-type', /^text/);
     *
     * @param {String} header key (case insensitive)
     * @param {String|RegExp} header value (optional)
     * @name header
     */
    Assertion.addMethod('header', function (key, value) {
      var header = getHeader(this._obj, key);
      var headerExists = header !== undefined && header !== null;
  
      if (arguments.length < 2) {
        this.assert(
          headerExists,
          'expected header #{exp} to exist',
          'expected header #{exp} to not exist',
          key,
          header
        );
      }
      else if (value instanceof RegExp) {
        this.assert(
          headerExists && value.test(header),
          "expected header '" + key + "' to match #{exp} but got #{act}",
          "expected header '" + key + "' to not match #{exp} but got #{act}",
          value,
          headerExists ? header : '<header-not-set>'
        );
      }
      else {
        this.assert(
          headerExists && header === value,
          "expected header '" + key + "' to have value #{exp} but got #{act}",
          "expected header '" + key + "' to not have value #{exp}",
          value,
          headerExists ? header : '<header-not-set>'
        );
      }
    });
  
    /**
     * Assert that a string represents valid ip address.
     *
     * @example:
     * expect('127.0.0.1').to.be.an.ip;
     * expect('2001:0db8:85a3:0000:0000:8a2e:0370:7334').to.be.an.ip;
     *
     * @name ip
     */
    Assertion.addProperty('ip', function () {
      this.assert(
        isIP(this._obj),
        'expected #{this} to be an ip',
        'expected #{this} to not be an ip'
      );
    });
  
    /**
     * Assert that a `Response` or `Request` object has a given content-type.
     *
     * @example:
     * expect(req).to.be.json;
     * expect(req).to.be.html;
     * expect(req).to.be.text;
     *
     * @name json
     * @name html
     * @name text
     */
    function checkContentType (name) {
      var val = contentTypes[name];
  
      Assertion.addProperty(name, function () {
        var contentType = getHeader(this._obj, 'content-type');
  
        this.assert(
          contentType && contentType.indexOf(val) >= 0,
          'expected the response type to be #{exp} but got #{act}',
          'expected the response type to not be #{exp} (#{act})',
          name,
          contentType || '<content-type-not-set>'
        );
      });
    }
  
    Object
      .keys(contentTypes)
      .forEach(checkContentType);
  
    /**
     * Assert that a `Response` object has a redirect status code.
     *
     * @example:
     * expect(res).to.redirect;
     *
     * @name redirect
     */
    Assertion.addProperty('redirect', function () {
      var status = this._obj.status;
  
      this.assert(
        wasRedirected(this._obj),
        'expected redirect status code but got ' + status,
        'expected not to redirect but got ' + status + ' status'
      );
    });
  
    /**
     * ### .redirectTo
     *
     * Assert that a `Response` object redirects to the supplied location.
     *
     * ```js
     * expect(res).to.redirectTo('http://example.com');
     * ```
     *
     * @param {String} location url
     * @name redirectTo
     */
    Assertion.addMethod('redirectTo', function (destination) {
      var redirects = this._obj.redirects;
      var isARedirect = wasRedirected(this._obj);
      var status = this._obj.status;
      var location = getHeader(this._obj, 'location');
  
      if (redirects && redirects.length) {
        this.assert(
          redirects.indexOf(destination) > -1,
          'expected redirect to ' + destination + ' but got ' + redirects.join(' then '),
          'expected not to redirect to ' + destination + ' but got ' + redirects.join(' then ')
        );
      }
      else {
        this.assert(
          isARedirect && location === destination,
          'expected redirect to #{exp} but got #{act}',
          'expected not to redirect to #{exp}',
          destination,
          isARedirect ? location : status
        );
      }
    });
  
    /**
     * Assert that a `Response` or `Request` object has query string parameters.
     *
     * @example:
     * expect(req).to.have.params;
     *
     * @name params
     */
    Assertion.addProperty('params', function () {
      var params = url.parse(this._obj.url, true).query;
  
      this.assert(
        Object.keys(params).length > 0,
        'expected the request to have query parameters',
        'expected the request to not have any query parameters'
      );
    });
  
    /**
     * Assert that a `Request` object has a query string parameter with a given
     * key, (optionally) equal to value
     *
     * @example:
     * expect(req).to.have.param('orderby');
     * expect(req).to.have.param('orderby', 'date');
     * expect(req).to.not.have.param('limit');
     *
     * @param {String} parameter name
     * @param {String} parameter value
     * @name param
     */
    Assertion.addMethod('param', function (name, value) {
      var params = url.parse(this._obj.url, true).query;
      var param = params[name];
      var paramExists = param !== undefined && param !== null;
  
      if (arguments.length < 2) {
        this.assert(
          paramExists,
          'expected query parameter #{exp} to exist',
          'expected query parameter #{exp} to not exist',
          name,
          param
        );
      }
      else if (value instanceof RegExp) {
        this.assert(
          paramExists && value.test(param),
          "expected query parameter '" + name + "' to match #{exp} but got #{act}",
          "expected query parameter '" + name + "' to not match #{exp} but got #{act}",
          value,
          paramExists ? param : '<parameter-does-not-exist>'
        );
      }
      else {
        this.assert(
          paramExists && param === value,
          "expected query parameter '" + name + "' to have value #{exp} but got #{act}",
          "expected query parameter '" + name + "' to not have value #{exp}",
          value,
          paramExists ? param : '<parameter-does-not-exist>'
        );
      }
    });
  
    /**
     * Assert that a `Response` or `Request` object has cookies.
     *
     * @example:
     * expect(req).to.have.cookies;
     *
     * @name cookies
     */
    Assertion.addProperty('cookies', function () {
      var type = this._obj.method ? 'request' : 'response';
      var allCookies = getCookies(this._obj);
  
      this.assert(
        allCookies.length > 0,
        'expected the ' + type + ' to have cookies',
        'expected the ' + type + ' to not have any cookies'
      );
    });
  
    /**
     * Assert that a `Request` or `Response` object has a cookie header with a
     * given key, (optionally) equal to value
     *
     * @example:
     * expect(req).to.have.cookie('session_id');
     * expect(req).to.have.cookie('session_id', '1234');
     * expect(req).to.not.have.cookie('PHPSESSID');
     * expect(res).to.have.cookie('session_id');
     * expect(res).to.have.cookie('session_id', '1234');
     * expect(res).to.not.have.cookie('PHPSESSID');
     *
     * @param {String} parameter name
     * @param {String} parameter value
     * @name cookie
     */
    Assertion.addMethod('cookie', function (name, value) {
      var cookie = getCookie(this._obj, name) || {};
      var cookieExists = cookie.value !== undefined && cookie.value !== null;
  
      if (arguments.length < 2) {
        this.assert(
          cookieExists,
          'expected cookie #{exp} to exist',
          'expected cookie #{exp} to not exist',
          name,
          cookie.value
        );
      }
      else if (value instanceof RegExp) {
        this.assert(
          cookieExists && value.test(cookie.value),
          "expected cookie '" + name + "' to match #{exp} but got #{act}",
          "expected cookie '" + name + "' to not match #{exp} but got #{act}",
          value,
          cookieExists ? cookie.value : '<cookie-not-set>'
        );
      }
      else {
        this.assert(
          cookieExists && cookie.value === value,
          "expected cookie '" + name + "' to have value #{exp} but got #{act}",
          "expected cookie '" + name + "' to not have value #{exp}",
          value,
          cookieExists ? cookie.value : '<cookie-not-set>'
        );
      }
    });
  
    /**
     * Asserts that the object matches the given JSON schema
     *
     * @example:
     * expect(req.body).to.have.scheam(myJsonSchema);
     *
     * @param {object} The JSON schema to validate against
     * @name schema
     */
    chai.Assertion.addMethod('schema', function (schema) {
      var valid = tv4.validate(this._obj, schema);
      if (!valid) {
        throw tv4.error;
      }
    });
  }
  
  /**
   * Return a header from `Request` or `Response` object.
   *
   * @param {Request|Response} object
   * @param {String} Header
   * @returns {String|Undefined}
   */
  function getHeader (obj, key) {
    // SuperAgent `response` object
    if (obj.getHeader) {
      return obj.getHeader(key);
    }
  
    // Postman `request` object
    key = (key || '').toLowerCase();
    var keys = Object.keys(obj.headers);
    for (var i = 0; i < keys.length; i++) {
      if (keys[i].toLowerCase() === key) {
        return obj.headers[keys[i]];
      }
    }
  }
  
  /**
   * Returns ALL cookies from a `Request` or `Response` object.
   *
   * @param {Request|Response} object
   * @returns {object[]}
   */
  function getCookies (obj) {
    // SuperAgent `response` object
    if (obj.cookies) {
      return obj.cookies;
    }
  
    // Postman `request` object
    var header = getHeader(obj, 'cookie');
    return cookies.parseRequestCookies(header);
  }
  
  /**
   * Returns a cookie from `Request` or `Response` object.
   *
   * @param {Request|Response} object
   * @param {String} name
   * @returns {String|Undefined}
   */
  function getCookie (obj, name) {
    // SuperAgent `response` object
    if (obj.getCookie) {
      return obj.getCookie(name);
    }
  
    // Postman `request` object
    var allCookies = getCookies(obj);
    return cookies.getCookie(allCookies, name);
  }
  
  /**
   * Determines whether a `Request` or `Response` object has been redirected.
   *
   * @param {Request|Response} object
   * @returns {Boolean}
   */
  function wasRedirected (obj) {
    var redirectCodes = [301, 302, 303, 307, 308];
    var redirects = obj.redirects;
    var status = obj.status;
  
    return redirectCodes.indexOf(status) >= 0 || redirects && redirects.length;
  }
  
  },{"./cookies":3,"is-ip":48,"url":58}],2:[function(require,module,exports){
  'use strict';
  
  var Runnable = require('./runnable');
  var Hook = require('./hook');
  var State = require('./state');
  
  module.exports = PostmanBDD;
  
  /**
   * The Postman BDD runtime
   */
  function PostmanBDD () {
    var state = this.state = new State();
  
    this.hooks = {
      before: new Hook('before', state),
      after: new Hook('after', state),
      beforeEach: new Hook('beforeEach', state),
      afterEach: new Hook('afterEach', state),
    };
  
    this.before = PostmanBDD.prototype.before.bind(this);
    this.after = PostmanBDD.prototype.after.bind(this);
    this.beforeEach = PostmanBDD.prototype.beforeEach.bind(this);
    this.afterEach = PostmanBDD.prototype.afterEach.bind(this);
    this.describe = PostmanBDD.prototype.describe.bind(this);
    this.it = PostmanBDD.prototype.it.bind(this);
  }
  
  /**
   * Registers a function to be called before any tests for a request.
   *
   * @param {string} [title] - Optinoal title for this hook
   * @param {function} fn - The hook to run
   */
  PostmanBDD.prototype.before = function (title, fn) {
    this.hooks.before.push(title, fn);
  };
  
  /**
   * Registers a function to be called after all tests for a request.
   *
   * @param {string} [title] - Optinoal title for this hook
   * @param {function} fn - The hook to run
   */
  PostmanBDD.prototype.after = function (title, fn) {
    this.hooks.after.push(title, fn);
  };
  
  /**
   * Registers a function to be called before each test.
   *
   * @param {string} [title] - Optinoal title for this hook
   * @param {function} fn - The hook to run
   */
  PostmanBDD.prototype.beforeEach = function (title, fn) {
    this.hooks.beforeEach.push(title, fn);
  };
  
  /**
   * Registers a function to be called after each test.
   *
   * @param {string} [title] - Optinoal title for this hook
   * @param {function} fn - The hook to run
   */
  PostmanBDD.prototype.afterEach = function (title, fn) {
    this.hooks.afterEach.push(title, fn);
  };
  
  /**
   * Runs a test suite.
   *
   * Any "before" hooks are run first.  Any "after" hooks are run afterward.
   *
   * @param {string} [title] - Optional title for this test suite
   * @param {function} fn - The test suite to run
   * @returns {object} - An object with test names as keys, and boolean results as values
   */
  PostmanBDD.prototype.describe = function (title, fn) {
    this.oneTimeInitialization();
  
    var runnable = new Runnable('describe', this.state, title, fn);
    runnable.run();
  
    if (this.state.isFinished()) {
      // This is a top-level `describe` block, so run any `after` hooks
      this.hooks.after.run();
    }
  
    return this.state.results;
  };
  
  /**
   * Runs a single test
   *
   * Any "beforeEach" hooks are run first.  Any "afterEach" hooks are run after.
   *
   * @param {string} [title] - Optional title for this test
   * @param {function} fn - The test to run
   * @returns {boolean} - The boolean result of the test
   */
  PostmanBDD.prototype.it = function (title, fn) {
    this.oneTimeInitialization();
    this.hooks.beforeEach.run();
  
    var runnable = new Runnable('it', this.state, title, fn);
    runnable.run();
  
    this.hooks.afterEach.run();
    return runnable.result;
  };
  
  /**
   * Inititializes state and runs `before` hooks before the first Runnable
   * in a new test script.
   */
  PostmanBDD.prototype.oneTimeInitialization = function () {
    if (!this.state.isStarted()) {
      // This is the first Runnable in a new test script,
      // so reset all state and run any `before` hooks
      this.hooks.before.run();
    }
  };
  
  
  },{"./hook":4,"./runnable":9,"./state":10}],3:[function(require,module,exports){
  'use strict';
  
  var CookieJar = require('cookiejar').CookieJar;
  var CookieAccessInfo = require('cookiejar').CookieAccessInfo;
  
  module.exports = {
    /**
     * Returns the cookie with the specified name from an array of cookies.
     *
     * @param {object[]} allCookies
     * @param {string} name
     * @returns {object|undefined}
     */
    getCookie: function (allCookies, name) {
      name = (name || '').toLowerCase();
  
      var foundCookie = allCookies.find(function (cookie) {
        return cookie && cookie.name.toLowerCase() === name;
      });
  
      return foundCookie;
    },
  
    /**
     * Parses a "Cookie" header and returns an array of cookie objects.
     *
     * @param {string} [header]
     * @returns {object[]}
     */
    parseRequestCookies: function (header) {
      var cookieJar = new CookieJar();
  
      if (header) {
        var cookies = header
          .split(';')
          .map(function (cookie) {
            return cookie.trim();
          });
  
        cookieJar.setCookies(cookies);
      }
  
      var allCookies = cookieJar.getCookies(CookieAccessInfo.All);
      return allCookies;
    },
  
    /**
     * Parses one or more "Set-Cookie" headers and returns an array of cookie objects.
     *
     * @param {string|string[]} [headers] - The value of the "Set-Cookie" header(s)
     * @returns {object[]}
     */
    parseResponseCookies: function (headers) {
      var cookieJar = new CookieJar();
  
      if (headers) {
        // The `setCookies` method supports a string or array of strings
        cookieJar.setCookies(headers);
      }
  
      var allCookies = cookieJar.getCookies(CookieAccessInfo.All);
      return allCookies;
    },
  };
  
  },{"cookiejar":47}],4:[function(require,module,exports){
  'use strict';
  
  var Runnable = require('./runnable');
  
  module.exports = Hook;
  
  /**
   * A hook is a list of runnables to run before/after a `describe` or `it` block.
   *
   * @param {string} type - The type of the hook (e.g. "before", "afterEach", etc)
   * @param {State} state - An object containing the state of the current test script
   */
  function Hook (type, state) {
    this.type = type;
    this.state = state;
    this.runnables = [];
  }
  
  /**
   * Runs all of this hook's runnables
   */
  Hook.prototype.run = function () {
    // Don't run if we're already in a hook
    if (!this.state.inAHook()) {
      this.runnables.forEach(function (runnable) {
        runnable.run();
      });
    }
  };
  
  /**
   * Adds a new runnable for this hook
   *
   * @param {string} [title] - Optional title for the runnable
   * @param {function} [fn] - The function to run
   */
  Hook.prototype.push = function (title, fn) {
    var runnable = new Runnable(this.type, this.state, title, fn);
    runnable.isHook = true;
    this.runnables.push(runnable);
  };
  
  },{"./runnable":9}],5:[function(require,module,exports){
  // Disable "strict mode" for this file,
  // so we can define variables with global scope
  /* eslint strict:off */
  
  var PostmanBDD = require('./bdd');
  var SuperAgent = require('./response');
  var assertions = require('./assertions');
  var options = require('./options');
  var log = require('./log');
  
  // Expose the Postman BDD options
  module.exports = options;
  
  // Expose a `reset()` method for testing purposes
  module.exports.reset = initPostmanBDD;
  
  // Initialize Postman BDD
  initPostmanBDD();
  
  /**
   * Defines (or redefines) all Postman BDD globals
   */
  function initPostmanBDD () {
    log.info('Using Postman BDD');
    initBDD();
    initSuperAgent();
    initChai();
  }
  
  /**
   * Defines (or redefines) BDD globals
   */
  function initBDD () {
    var postmanBDD = new PostmanBDD();
    before = postmanBDD.before;
    after = postmanBDD.after;
    beforeEach = postmanBDD.beforeEach;
    afterEach = postmanBDD.afterEach;
    describe = postmanBDD.describe;
    it = postmanBDD.it;
  }
  
  /**
   * Defines (or redefines) SuperAgent globals
   */
  function initSuperAgent () {
    var superAgent = new SuperAgent();
    response = superAgent.response;
  }
  
  /**
   * Defines (or redefines) Chai.js globals
   */
  function initChai () {
    chai = require('chai');
    assert = chai.assert;
    expect = chai.expect;
    chai.should();
  
    // Chai-HTTP Assertions
    chai.use(assertions);
  }
  
  },{"./assertions":1,"./bdd":2,"./log":6,"./options":7,"./response":8,"chai":11}],6:[function(require,module,exports){
  'use strict';
  
  var options = require('./options');
  
  var levels = ['silent', 'error', 'warn', 'info', 'debug'];
  
  var log = module.exports = {
    /**
     * Determines whether the given logging level is enabled
     *
     * @param {string} level
     * @returns {boolean}
     */
    isEnabled: function (level) {
      return levels.indexOf(options.logLevel) >= levels.indexOf(level);
    },
  };
  
  levels.forEach(function (level) {
    log[level] = function () {
      if (this.isEnabled(level)) {
        var logMethod = console.log;
        if (typeof console[level] === 'function') {
          logMethod = console[level];
        }
  
        logMethod.apply(console, arguments);
      }
    };
  });
  
  },{"./options":7}],7:[function(require,module,exports){
  'use strict';
  
  module.exports = {
    /**
     * The logging level (silent, error, warn, info, debug)
     *
     * @type {string}
     */
    logLevel: 'warn',
  };
  
  },{}],8:[function(require,module,exports){
  'use strict';
  
  var cookies = require('./cookies');
  
  /**
   * SuperAgent's Response API
   *
   * For more info, see:
   * https://visionmedia.github.io/superagent/#response-properties
   */
  module.exports = function SuperAgent () {
    var superAgent = this;
  
    superAgent.response = {
      /**
       * Returns the value of the given header.  Header names are case insensitive.
       *
       * https://visionmedia.github.io/superagent/#response-content-type
       *
       * @param {string} name
       * @returns {?string}
       */
      getHeader: function (name) {
        if (typeof postman === 'object' && typeof postman.getResponseHeader === 'function') {
          return postman.getResponseHeader(name);
        }
        else {
          name = (name || '').toLowerCase();
          return superAgent.response.headers[name];
        }
      },
  
      /**
       * Returns the value of the given cookie.
       *
       * @param {string} name
       * @returns {?string}
       */
      getCookie: function (name) {
        if (typeof postman === 'object' && typeof postman.getResponseCookie === 'function') {
          return postman.getResponseCookie(name);
        }
        else {
          return cookies.getCookie(superAgent.response.cookies, name);
        }
      },
    };
  
    defineProperties(superAgent.response, {
      /**
       * Returns the HTTP response status code
       * @type {number}
       */
      status: function () {
        return typeof responseCode === 'object' ? responseCode.code : 0;
      },
  
      /**
       * Returns the HTTP response status type (1, 2, 3, 4, or 5)
       * @type {number}
       */
      statusType: function () {
        return Math.floor(superAgent.response.status / 100);
      },
  
      /**
       * Indicates whether the response is an HTTP "info" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      info: function () {
        return superAgent.response.statusType === 1;
      },
  
      /**
       * Indicates whether the response is an HTTP "ok" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      ok: function () {
        return superAgent.response.statusType === 2;
      },
  
      /**
       * Indicates whether the response is an HTTP "redirect" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      redirect: function () {
        return superAgent.response.statusType === 3;
      },
  
      /**
       * Indicates whether the response is an HTTP "client error" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      clientError: function () {
        return superAgent.response.statusType === 4;
      },
  
      /**
       * Indicates whether the response is an HTTP "server error" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      serverError: function () {
        return superAgent.response.statusType === 5;
      },
  
      /**
       * Indicates whether the response is an HTTP error status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      error: function () {
        return superAgent.response.clientError || superAgent.response.serverError;
      },
  
      /**
       * Indicates whether the response is an HTTP "accepted" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      accepted: function () {
        return superAgent.response.status === 202;
      },
  
      /**
       * Indicates whether the response is an HTTP "no content" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      noContent: function () {
        return superAgent.response.status === 204 || superAgent.response.status === 1223;
      },
  
      /**
       * Indicates whether the response is an HTTP "bad request" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      badRequest: function () {
        return superAgent.response.status === 400;
      },
  
      /**
       * Indicates whether the response is an HTTP "unauthorized" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      unauthorized: function () {
        return superAgent.response.status === 401;
      },
  
      /**
       * Indicates whether the response is an HTTP "not acceptable" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      notAcceptable: function () {
        return superAgent.response.status === 406;
      },
  
      /**
       * Indicates whether the response is an HTTP "not found" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      notFound: function () {
        return superAgent.response.status === 404;
      },
  
      /**
       * Indicates whether the response is an HTTP "forbidden" status
       *
       * https://visionmedia.github.io/superagent/#response-status
       *
       * @type {boolean}
       */
      forbidden: function () {
        return superAgent.response.status === 403;
      },
  
      /**
       * Returns the unparsed response body string
       * @type {string}
       */
      text: function () {
        return typeof responseBody === 'string' ? responseBody : '';
      },
  
      /**
       * The parsed response body.
       * @type {object}
       */
      body: function () {
        try {
          return JSON.parse(superAgent.response.text);
        }
        catch (e) {
          return {};
        }
      },
  
      /**
       * The parsed response headers, with lowercased field names.
       *
       * NOTE: SuperAgent exposes this property as both `header` and `headers`
       *
       * @type {object}
       */
      header: function () {
        return typeof responseHeaders === 'object' ? responseHeaders : {};
      },
  
      /**
       * The parsed response headers, with lowercased field names.
       *
       * NOTE: SuperAgent exposes this property as both `header` and `headers`
       *
       * @type {object}
       */
      headers: function () {
        return typeof responseHeaders === 'object' ? responseHeaders : {};
      },
  
      /**
       * The response time, in milliseconds
       * @type {number}
       */
      time: function () {
        return typeof responseTime === 'number' ? responseTime : 0;
      },
  
      /**
       * Returns the value of the Content-Type header without the charset (e.g. "text/html")
       * @type {string}
       */
      type: function () {
        var contentType = superAgent.response.getHeader('content-type') || '';
        return contentType.split(';')[0];
      },
  
      /**
       * Returns the value of the Content-Type header without the MIME type (e.g. "utf8")
       * @type {string}
       */
      charset: function () {
        var contentType = superAgent.response.getHeader('content-type') || '';
        var match = /charset=([a-zA-Z0-9_-]+)/i.exec(contentType);
        if (!match) { return ''; }
        return match[1];
      },
  
      /**
       * The parsed response cookies.
       *
       * @type {object[]}
       */
      cookies: function () {
        if (typeof responseCookies === 'object' && responseCookies.length > 0) {
          return responseCookies;
        }
  
        var header = this.getHeader('set-cookie');
        return cookies.parseResponseCookies(header);
      },
    });
  };
  
  /**
   * Defines the read-only property getters on the given object
   *
   * @param {object} getters
   */
  function defineProperties (obj, getters) {
    Object.keys(getters).forEach(function (name) {
      Object.defineProperty(obj, name, {
        configurable: true,
        enumerable: true,
        get: getters[name],
      });
    });
  }
  
  },{"./cookies":3}],9:[function(require,module,exports){
  'use strict';
  
  var log = require('./log');
  
  module.exports = Runnable;
  
  /**
   * Runs a user-defined function, and captures the results.
   * Runnables include test suites (describe), tests (it), and hooks (before, after, beforeEach, afterEach)
   *
   * @param {string} type - The type of runnable ("describe", "it", "before", "afterEach", etc.)
   * @param {State} state - An object containing the state of the current test script
   * @param {string} [title] - Optional title for the runnable
   * @param {function} [fn] - The function to run
   * @class
   */
  function Runnable (type, state, title, fn) {
    if (typeof title === 'function') {
      fn = title;
      title = '';
    }
  
    this.type = type;
    this.state = state;
    this.isHook = false;
    this.title = title;
    this.fn = fn;
    this.result = null;
    this.error = null;
  }
  
  /**
   * Runs the user-defined function and captures the results.
   *
   * The result is a boolean value, which can be accessed at {@link Runnable#result}.
   * If no error occurrs, then the result is `true`.  For "it" tests, this result is also added
   * to {@link State.results}, so it can be returned to the Postman Collection Runner.
   * If an error DOES occur, then the result is `false`, and the result is ALWAYS added to
   * {@link State.results}, even for hooks and test suites.
   */
  Runnable.prototype.run = function run () {
    this.state.counters[this.type]++;
    this.title = this.title ||
      ((this.type === 'it' ? 'test' : this.type) + ' #' + this.state.counters[this.type]);
  
    this.state.stack.push(this);
    var fullTitle = this.state.stack.toString();
    log.debug('Running ' + fullTitle);
  
    try {
      this.fn();
      this.success(fullTitle);
    }
    catch (e) {
      this.failure(e, fullTitle);
    }
    finally {
      this.state.stack.pop();
    }
  };
  
  /**
   * Records a successful result for this runnable.
   *
   * @param {string} [fullTitle] - The full title (including any parent Runnables)
   */
  Runnable.prototype.success = function (fullTitle) {
    log.info('passed: ' + fullTitle);
  
    this.result = true;
  
    if (this.type === 'it') {
      this.state.results[fullTitle || this.title] = true;
    }
  };
  
  /**
   * Records a failure result for this runnable.
   *
   * @param {Error} err - The error that occurred
   * @param {string} [fullTitle] - The full title (including any parent Runnables)
   */
  Runnable.prototype.failure = function (err, fullTitle) {
    log.error('failed: ' + fullTitle, errorToPOJO(err));
  
    this.result = false;
    this.error = err;
    this.state.results[fullTitle || this.title] = false;
    this.state.results[err.message] = false;
  };
  
  /**
   * Returns a POJO containing all the properties of the given Error object.
   * This is necessary because Postman's `console.log()` methods don't include
   * properties from the Error prototype.
   *
   * @param {Error} err
   * @returns {object|undefined}
   */
  function errorToPOJO (err) {
    if (err && typeof err === 'object') {
      return Object.keys(err).concat(['name', 'message', 'stack']).reduce(function (pojo, key) {
        pojo[key] = err[key];
        return pojo;
      }, {});
    }
  }
  
  },{"./log":6}],10:[function(require,module,exports){
  'use strict';
  
  module.exports = State;
  
  /**
   * Keeps track of the state for a single Postman test script.
   */
  function State () {
    /**
     * Postman's global `tests` variable.
     * All test results must be stored on this object as boolean properties
     */
    this.results = resetTests();
  
    /**
     * The stack of runnables that are currently running
     */
    this.stack = [];
  
    /**
     * Keeps track of how many runnables of each type are currently running.
     */
    this.counters = {
      describe: 0,
      it: 0,
      before: 0,
      after: 0,
      beforeEach: 0,
      afterEach: 0,
    };
  
    /**
     * Pretty formatting for the stack
     */
    this.stack.toString = function () {
      return this.map(function (r) { return r.title; }).join(' ');
    };
  }
  
  /**
   * Determines whether the test script has started
   * (i.e. at least one `describe`, `it`, or hook has started)
   *
   * @returns {boolean}
   */
  State.prototype.isStarted = function () {
    var me = this;
  
    if (this.stack.length > 0) {
      // We're currently in a Runnable
      return true;
    }
    else {
      // Have any Runnables ran yet?
      return Object.keys(this.counters).some(function (key) {
        return me.counters[key] > 0;
      });
    }
  };
  
  /**
   * Determines whether the test script has finished
   * (i.e. the top-level `describe` block has finished running)
   *
   * @returns {boolean}
   */
  State.prototype.isFinished = function () {
    return this.stack.length === 0 && this.counters.describe > 0;
  };
  
  /**
   * Determines whether we are currently inside a hook
   *
   * @returns {boolean}
   */
  State.prototype.inAHook = function () {
    return this.stack.some(function (runnable) {
      return runnable.isHook;
    });
  };
  
  /**
   * Deletes all properties of the Postman `tests` object, to reset any previous
   * test state. This is necessary when the user clicks the "Send" button multiple
   * times in Request Builder, which re-uses the same `tests` object each time.
   *
   * @reeturns {object} - Returns the empty `tests` object
   */
  function resetTests () {
    if (typeof tests !== 'object') {
      throw new Error(
        'Postman BDD can only run inside the Postman scripting runtime ' +
        '(the "tests" global variable is missing)'
      );
    }
  
    // Clear any results from a previous test run
    // (this happens when the user user clicks the "send" button multiple times in Request Builder)
    Object.keys(tests).forEach(function (key) {
      delete tests[key];
    });
  
    return tests;
  }
  
  },{}],11:[function(require,module,exports){
  module.exports = require('./lib/chai');
  
  },{"./lib/chai":12}],12:[function(require,module,exports){
  /*!
   * chai
   * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  var used = []
    , exports = module.exports = {};
  
  /*!
   * Chai version
   */
  
  exports.version = '3.5.0';
  
  /*!
   * Assertion Error
   */
  
  exports.AssertionError = require('assertion-error');
  
  /*!
   * Utils for plugins (not exported)
   */
  
  var util = require('./chai/utils');
  
  /**
   * # .use(function)
   *
   * Provides a way to extend the internals of Chai
   *
   * @param {Function}
   * @returns {this} for chaining
   * @api public
   */
  
  exports.use = function (fn) {
    if (!~used.indexOf(fn)) {
      fn(this, util);
      used.push(fn);
    }
  
    return this;
  };
  
  /*!
   * Utility Functions
   */
  
  exports.util = util;
  
  /*!
   * Configuration
   */
  
  var config = require('./chai/config');
  exports.config = config;
  
  /*!
   * Primary `Assertion` prototype
   */
  
  var assertion = require('./chai/assertion');
  exports.use(assertion);
  
  /*!
   * Core Assertions
   */
  
  var core = require('./chai/core/assertions');
  exports.use(core);
  
  /*!
   * Expect interface
   */
  
  var expect = require('./chai/interface/expect');
  exports.use(expect);
  
  /*!
   * Should interface
   */
  
  var should = require('./chai/interface/should');
  exports.use(should);
  
  /*!
   * Assert interface
   */
  
  var assert = require('./chai/interface/assert');
  exports.use(assert);
  
  },{"./chai/assertion":13,"./chai/config":14,"./chai/core/assertions":15,"./chai/interface/assert":16,"./chai/interface/expect":17,"./chai/interface/should":18,"./chai/utils":32,"assertion-error":40}],13:[function(require,module,exports){
  /*!
   * chai
   * http://chaijs.com
   * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  var config = require('./config');
  
  module.exports = function (_chai, util) {
    /*!
     * Module dependencies.
     */
  
    var AssertionError = _chai.AssertionError
      , flag = util.flag;
  
    /*!
     * Module export.
     */
  
    _chai.Assertion = Assertion;
  
    /*!
     * Assertion Constructor
     *
     * Creates object for chaining.
     *
     * @api private
     */
  
    function Assertion (obj, msg, stack) {
      flag(this, 'ssfi', stack || arguments.callee);
      flag(this, 'object', obj);
      flag(this, 'message', msg);
    }
  
    Object.defineProperty(Assertion, 'includeStack', {
      get: function() {
        console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
        return config.includeStack;
      },
      set: function(value) {
        console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
        config.includeStack = value;
      }
    });
  
    Object.defineProperty(Assertion, 'showDiff', {
      get: function() {
        console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
        return config.showDiff;
      },
      set: function(value) {
        console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
        config.showDiff = value;
      }
    });
  
    Assertion.addProperty = function (name, fn) {
      util.addProperty(this.prototype, name, fn);
    };
  
    Assertion.addMethod = function (name, fn) {
      util.addMethod(this.prototype, name, fn);
    };
  
    Assertion.addChainableMethod = function (name, fn, chainingBehavior) {
      util.addChainableMethod(this.prototype, name, fn, chainingBehavior);
    };
  
    Assertion.overwriteProperty = function (name, fn) {
      util.overwriteProperty(this.prototype, name, fn);
    };
  
    Assertion.overwriteMethod = function (name, fn) {
      util.overwriteMethod(this.prototype, name, fn);
    };
  
    Assertion.overwriteChainableMethod = function (name, fn, chainingBehavior) {
      util.overwriteChainableMethod(this.prototype, name, fn, chainingBehavior);
    };
  
    /**
     * ### .assert(expression, message, negateMessage, expected, actual, showDiff)
     *
     * Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
     *
     * @name assert
     * @param {Philosophical} expression to be tested
     * @param {String|Function} message or function that returns message to display if expression fails
     * @param {String|Function} negatedMessage or function that returns negatedMessage to display if negated expression fails
     * @param {Mixed} expected value (remember to check for negation)
     * @param {Mixed} actual (optional) will default to `this.obj`
     * @param {Boolean} showDiff (optional) when set to `true`, assert will display a diff in addition to the message if expression fails
     * @api private
     */
  
    Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual, showDiff) {
      var ok = util.test(this, arguments);
      if (true !== showDiff) showDiff = false;
      if (true !== config.showDiff) showDiff = false;
  
      if (!ok) {
        var msg = util.getMessage(this, arguments)
          , actual = util.getActual(this, arguments);
        throw new AssertionError(msg, {
            actual: actual
          , expected: expected
          , showDiff: showDiff
        }, (config.includeStack) ? this.assert : flag(this, 'ssfi'));
      }
    };
  
    /*!
     * ### ._obj
     *
     * Quick reference to stored `actual` value for plugin developers.
     *
     * @api private
     */
  
    Object.defineProperty(Assertion.prototype, '_obj',
      { get: function () {
          return flag(this, 'object');
        }
      , set: function (val) {
          flag(this, 'object', val);
        }
    });
  };
  
  },{"./config":14}],14:[function(require,module,exports){
  module.exports = {
  
    /**
     * ### config.includeStack
     *
     * User configurable property, influences whether stack trace
     * is included in Assertion error message. Default of false
     * suppresses stack trace in the error message.
     *
     *     chai.config.includeStack = true;  // enable stack on error
     *
     * @param {Boolean}
     * @api public
     */
  
     includeStack: false,
  
    /**
     * ### config.showDiff
     *
     * User configurable property, influences whether or not
     * the `showDiff` flag should be included in the thrown
     * AssertionErrors. `false` will always be `false`; `true`
     * will be true when the assertion has requested a diff
     * be shown.
     *
     * @param {Boolean}
     * @api public
     */
  
    showDiff: true,
  
    /**
     * ### config.truncateThreshold
     *
     * User configurable property, sets length threshold for actual and
     * expected values in assertion errors. If this threshold is exceeded, for
     * example for large data structures, the value is replaced with something
     * like `[ Array(3) ]` or `{ Object (prop1, prop2) }`.
     *
     * Set it to zero if you want to disable truncating altogether.
     *
     * This is especially userful when doing assertions on arrays: having this
     * set to a reasonable large value makes the failure messages readily
     * inspectable.
     *
     *     chai.config.truncateThreshold = 0;  // disable truncating
     *
     * @param {Number}
     * @api public
     */
  
    truncateThreshold: 40
  
  };
  
  },{}],15:[function(require,module,exports){
  /*!
   * chai
   * http://chaijs.com
   * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  module.exports = function (chai, _) {
    var Assertion = chai.Assertion
      , toString = Object.prototype.toString
      , flag = _.flag;
  
    /**
     * ### Language Chains
     *
     * The following are provided as chainable getters to
     * improve the readability of your assertions. They
     * do not provide testing capabilities unless they
     * have been overwritten by a plugin.
     *
     * **Chains**
     *
     * - to
     * - be
     * - been
     * - is
     * - that
     * - which
     * - and
     * - has
     * - have
     * - with
     * - at
     * - of
     * - same
     *
     * @name language chains
     * @namespace BDD
     * @api public
     */
  
    [ 'to', 'be', 'been'
    , 'is', 'and', 'has', 'have'
    , 'with', 'that', 'which', 'at'
    , 'of', 'same' ].forEach(function (chain) {
      Assertion.addProperty(chain, function () {
        return this;
      });
    });
  
    /**
     * ### .not
     *
     * Negates any of assertions following in the chain.
     *
     *     expect(foo).to.not.equal('bar');
     *     expect(goodFn).to.not.throw(Error);
     *     expect({ foo: 'baz' }).to.have.property('foo')
     *       .and.not.equal('bar');
     *
     * @name not
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('not', function () {
      flag(this, 'negate', true);
    });
  
    /**
     * ### .deep
     *
     * Sets the `deep` flag, later used by the `equal` and
     * `property` assertions.
     *
     *     expect(foo).to.deep.equal({ bar: 'baz' });
     *     expect({ foo: { bar: { baz: 'quux' } } })
     *       .to.have.deep.property('foo.bar.baz', 'quux');
     *
     * `.deep.property` special characters can be escaped
     * by adding two slashes before the `.` or `[]`.
     *
     *     var deepCss = { '.link': { '[target]': 42 }};
     *     expect(deepCss).to.have.deep.property('\\.link.\\[target\\]', 42);
     *
     * @name deep
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('deep', function () {
      flag(this, 'deep', true);
    });
  
    /**
     * ### .any
     *
     * Sets the `any` flag, (opposite of the `all` flag)
     * later used in the `keys` assertion.
     *
     *     expect(foo).to.have.any.keys('bar', 'baz');
     *
     * @name any
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('any', function () {
      flag(this, 'any', true);
      flag(this, 'all', false)
    });
  
  
    /**
     * ### .all
     *
     * Sets the `all` flag (opposite of the `any` flag)
     * later used by the `keys` assertion.
     *
     *     expect(foo).to.have.all.keys('bar', 'baz');
     *
     * @name all
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('all', function () {
      flag(this, 'all', true);
      flag(this, 'any', false);
    });
  
    /**
     * ### .a(type)
     *
     * The `a` and `an` assertions are aliases that can be
     * used either as language chains or to assert a value's
     * type.
     *
     *     // typeof
     *     expect('test').to.be.a('string');
     *     expect({ foo: 'bar' }).to.be.an('object');
     *     expect(null).to.be.a('null');
     *     expect(undefined).to.be.an('undefined');
     *     expect(new Error).to.be.an('error');
     *     expect(new Promise).to.be.a('promise');
     *     expect(new Float32Array()).to.be.a('float32array');
     *     expect(Symbol()).to.be.a('symbol');
     *
     *     // es6 overrides
     *     expect({[Symbol.toStringTag]:()=>'foo'}).to.be.a('foo');
     *
     *     // language chain
     *     expect(foo).to.be.an.instanceof(Foo);
     *
     * @name a
     * @alias an
     * @param {String} type
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function an (type, msg) {
      if (msg) flag(this, 'message', msg);
      type = type.toLowerCase();
      var obj = flag(this, 'object')
        , article = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(type.charAt(0)) ? 'an ' : 'a ';
  
      this.assert(
          type === _.type(obj)
        , 'expected #{this} to be ' + article + type
        , 'expected #{this} not to be ' + article + type
      );
    }
  
    Assertion.addChainableMethod('an', an);
    Assertion.addChainableMethod('a', an);
  
    /**
     * ### .include(value)
     *
     * The `include` and `contain` assertions can be used as either property
     * based language chains or as methods to assert the inclusion of an object
     * in an array or a substring in a string. When used as language chains,
     * they toggle the `contains` flag for the `keys` assertion.
     *
     *     expect([1,2,3]).to.include(2);
     *     expect('foobar').to.contain('foo');
     *     expect({ foo: 'bar', hello: 'universe' }).to.include.keys('foo');
     *
     * @name include
     * @alias contain
     * @alias includes
     * @alias contains
     * @param {Object|String|Number} obj
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function includeChainingBehavior () {
      flag(this, 'contains', true);
    }
  
    function include (val, msg) {
      _.expectTypes(this, ['array', 'object', 'string']);
  
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      var expected = false;
  
      if (_.type(obj) === 'array' && _.type(val) === 'object') {
        for (var i in obj) {
          if (_.eql(obj[i], val)) {
            expected = true;
            break;
          }
        }
      } else if (_.type(val) === 'object') {
        if (!flag(this, 'negate')) {
          for (var k in val) new Assertion(obj).property(k, val[k]);
          return;
        }
        var subset = {};
        for (var k in val) subset[k] = obj[k];
        expected = _.eql(subset, val);
      } else {
        expected = (obj != undefined) && ~obj.indexOf(val);
      }
      this.assert(
          expected
        , 'expected #{this} to include ' + _.inspect(val)
        , 'expected #{this} to not include ' + _.inspect(val));
    }
  
    Assertion.addChainableMethod('include', include, includeChainingBehavior);
    Assertion.addChainableMethod('contain', include, includeChainingBehavior);
    Assertion.addChainableMethod('contains', include, includeChainingBehavior);
    Assertion.addChainableMethod('includes', include, includeChainingBehavior);
  
    /**
     * ### .ok
     *
     * Asserts that the target is truthy.
     *
     *     expect('everything').to.be.ok;
     *     expect(1).to.be.ok;
     *     expect(false).to.not.be.ok;
     *     expect(undefined).to.not.be.ok;
     *     expect(null).to.not.be.ok;
     *
     * @name ok
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('ok', function () {
      this.assert(
          flag(this, 'object')
        , 'expected #{this} to be truthy'
        , 'expected #{this} to be falsy');
    });
  
    /**
     * ### .true
     *
     * Asserts that the target is `true`.
     *
     *     expect(true).to.be.true;
     *     expect(1).to.not.be.true;
     *
     * @name true
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('true', function () {
      this.assert(
          true === flag(this, 'object')
        , 'expected #{this} to be true'
        , 'expected #{this} to be false'
        , this.negate ? false : true
      );
    });
  
    /**
     * ### .false
     *
     * Asserts that the target is `false`.
     *
     *     expect(false).to.be.false;
     *     expect(0).to.not.be.false;
     *
     * @name false
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('false', function () {
      this.assert(
          false === flag(this, 'object')
        , 'expected #{this} to be false'
        , 'expected #{this} to be true'
        , this.negate ? true : false
      );
    });
  
    /**
     * ### .null
     *
     * Asserts that the target is `null`.
     *
     *     expect(null).to.be.null;
     *     expect(undefined).to.not.be.null;
     *
     * @name null
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('null', function () {
      this.assert(
          null === flag(this, 'object')
        , 'expected #{this} to be null'
        , 'expected #{this} not to be null'
      );
    });
  
    /**
     * ### .undefined
     *
     * Asserts that the target is `undefined`.
     *
     *     expect(undefined).to.be.undefined;
     *     expect(null).to.not.be.undefined;
     *
     * @name undefined
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('undefined', function () {
      this.assert(
          undefined === flag(this, 'object')
        , 'expected #{this} to be undefined'
        , 'expected #{this} not to be undefined'
      );
    });
  
    /**
     * ### .NaN
     * Asserts that the target is `NaN`.
     *
     *     expect('foo').to.be.NaN;
     *     expect(4).not.to.be.NaN;
     *
     * @name NaN
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('NaN', function () {
      this.assert(
          isNaN(flag(this, 'object'))
          , 'expected #{this} to be NaN'
          , 'expected #{this} not to be NaN'
      );
    });
  
    /**
     * ### .exist
     *
     * Asserts that the target is neither `null` nor `undefined`.
     *
     *     var foo = 'hi'
     *       , bar = null
     *       , baz;
     *
     *     expect(foo).to.exist;
     *     expect(bar).to.not.exist;
     *     expect(baz).to.not.exist;
     *
     * @name exist
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('exist', function () {
      this.assert(
          null != flag(this, 'object')
        , 'expected #{this} to exist'
        , 'expected #{this} to not exist'
      );
    });
  
  
    /**
     * ### .empty
     *
     * Asserts that the target's length is `0`. For arrays and strings, it checks
     * the `length` property. For objects, it gets the count of
     * enumerable keys.
     *
     *     expect([]).to.be.empty;
     *     expect('').to.be.empty;
     *     expect({}).to.be.empty;
     *
     * @name empty
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('empty', function () {
      var obj = flag(this, 'object')
        , expected = obj;
  
      if (Array.isArray(obj) || 'string' === typeof object) {
        expected = obj.length;
      } else if (typeof obj === 'object') {
        expected = Object.keys(obj).length;
      }
  
      this.assert(
          !expected
        , 'expected #{this} to be empty'
        , 'expected #{this} not to be empty'
      );
    });
  
    /**
     * ### .arguments
     *
     * Asserts that the target is an arguments object.
     *
     *     function test () {
     *       expect(arguments).to.be.arguments;
     *     }
     *
     * @name arguments
     * @alias Arguments
     * @namespace BDD
     * @api public
     */
  
    function checkArguments () {
      var obj = flag(this, 'object')
        , type = Object.prototype.toString.call(obj);
      this.assert(
          '[object Arguments]' === type
        , 'expected #{this} to be arguments but got ' + type
        , 'expected #{this} to not be arguments'
      );
    }
  
    Assertion.addProperty('arguments', checkArguments);
    Assertion.addProperty('Arguments', checkArguments);
  
    /**
     * ### .equal(value)
     *
     * Asserts that the target is strictly equal (`===`) to `value`.
     * Alternately, if the `deep` flag is set, asserts that
     * the target is deeply equal to `value`.
     *
     *     expect('hello').to.equal('hello');
     *     expect(42).to.equal(42);
     *     expect(1).to.not.equal(true);
     *     expect({ foo: 'bar' }).to.not.equal({ foo: 'bar' });
     *     expect({ foo: 'bar' }).to.deep.equal({ foo: 'bar' });
     *
     * @name equal
     * @alias equals
     * @alias eq
     * @alias deep.equal
     * @param {Mixed} value
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertEqual (val, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      if (flag(this, 'deep')) {
        return this.eql(val);
      } else {
        this.assert(
            val === obj
          , 'expected #{this} to equal #{exp}'
          , 'expected #{this} to not equal #{exp}'
          , val
          , this._obj
          , true
        );
      }
    }
  
    Assertion.addMethod('equal', assertEqual);
    Assertion.addMethod('equals', assertEqual);
    Assertion.addMethod('eq', assertEqual);
  
    /**
     * ### .eql(value)
     *
     * Asserts that the target is deeply equal to `value`.
     *
     *     expect({ foo: 'bar' }).to.eql({ foo: 'bar' });
     *     expect([ 1, 2, 3 ]).to.eql([ 1, 2, 3 ]);
     *
     * @name eql
     * @alias eqls
     * @param {Mixed} value
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertEql(obj, msg) {
      if (msg) flag(this, 'message', msg);
      this.assert(
          _.eql(obj, flag(this, 'object'))
        , 'expected #{this} to deeply equal #{exp}'
        , 'expected #{this} to not deeply equal #{exp}'
        , obj
        , this._obj
        , true
      );
    }
  
    Assertion.addMethod('eql', assertEql);
    Assertion.addMethod('eqls', assertEql);
  
    /**
     * ### .above(value)
     *
     * Asserts that the target is greater than `value`.
     *
     *     expect(10).to.be.above(5);
     *
     * Can also be used in conjunction with `length` to
     * assert a minimum length. The benefit being a
     * more informative error message than if the length
     * was supplied directly.
     *
     *     expect('foo').to.have.length.above(2);
     *     expect([ 1, 2, 3 ]).to.have.length.above(2);
     *
     * @name above
     * @alias gt
     * @alias greaterThan
     * @param {Number} value
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertAbove (n, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      if (flag(this, 'doLength')) {
        new Assertion(obj, msg).to.have.property('length');
        var len = obj.length;
        this.assert(
            len > n
          , 'expected #{this} to have a length above #{exp} but got #{act}'
          , 'expected #{this} to not have a length above #{exp}'
          , n
          , len
        );
      } else {
        this.assert(
            obj > n
          , 'expected #{this} to be above ' + n
          , 'expected #{this} to be at most ' + n
        );
      }
    }
  
    Assertion.addMethod('above', assertAbove);
    Assertion.addMethod('gt', assertAbove);
    Assertion.addMethod('greaterThan', assertAbove);
  
    /**
     * ### .least(value)
     *
     * Asserts that the target is greater than or equal to `value`.
     *
     *     expect(10).to.be.at.least(10);
     *
     * Can also be used in conjunction with `length` to
     * assert a minimum length. The benefit being a
     * more informative error message than if the length
     * was supplied directly.
     *
     *     expect('foo').to.have.length.of.at.least(2);
     *     expect([ 1, 2, 3 ]).to.have.length.of.at.least(3);
     *
     * @name least
     * @alias gte
     * @param {Number} value
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertLeast (n, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      if (flag(this, 'doLength')) {
        new Assertion(obj, msg).to.have.property('length');
        var len = obj.length;
        this.assert(
            len >= n
          , 'expected #{this} to have a length at least #{exp} but got #{act}'
          , 'expected #{this} to have a length below #{exp}'
          , n
          , len
        );
      } else {
        this.assert(
            obj >= n
          , 'expected #{this} to be at least ' + n
          , 'expected #{this} to be below ' + n
        );
      }
    }
  
    Assertion.addMethod('least', assertLeast);
    Assertion.addMethod('gte', assertLeast);
  
    /**
     * ### .below(value)
     *
     * Asserts that the target is less than `value`.
     *
     *     expect(5).to.be.below(10);
     *
     * Can also be used in conjunction with `length` to
     * assert a maximum length. The benefit being a
     * more informative error message than if the length
     * was supplied directly.
     *
     *     expect('foo').to.have.length.below(4);
     *     expect([ 1, 2, 3 ]).to.have.length.below(4);
     *
     * @name below
     * @alias lt
     * @alias lessThan
     * @param {Number} value
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertBelow (n, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      if (flag(this, 'doLength')) {
        new Assertion(obj, msg).to.have.property('length');
        var len = obj.length;
        this.assert(
            len < n
          , 'expected #{this} to have a length below #{exp} but got #{act}'
          , 'expected #{this} to not have a length below #{exp}'
          , n
          , len
        );
      } else {
        this.assert(
            obj < n
          , 'expected #{this} to be below ' + n
          , 'expected #{this} to be at least ' + n
        );
      }
    }
  
    Assertion.addMethod('below', assertBelow);
    Assertion.addMethod('lt', assertBelow);
    Assertion.addMethod('lessThan', assertBelow);
  
    /**
     * ### .most(value)
     *
     * Asserts that the target is less than or equal to `value`.
     *
     *     expect(5).to.be.at.most(5);
     *
     * Can also be used in conjunction with `length` to
     * assert a maximum length. The benefit being a
     * more informative error message than if the length
     * was supplied directly.
     *
     *     expect('foo').to.have.length.of.at.most(4);
     *     expect([ 1, 2, 3 ]).to.have.length.of.at.most(3);
     *
     * @name most
     * @alias lte
     * @param {Number} value
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertMost (n, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      if (flag(this, 'doLength')) {
        new Assertion(obj, msg).to.have.property('length');
        var len = obj.length;
        this.assert(
            len <= n
          , 'expected #{this} to have a length at most #{exp} but got #{act}'
          , 'expected #{this} to have a length above #{exp}'
          , n
          , len
        );
      } else {
        this.assert(
            obj <= n
          , 'expected #{this} to be at most ' + n
          , 'expected #{this} to be above ' + n
        );
      }
    }
  
    Assertion.addMethod('most', assertMost);
    Assertion.addMethod('lte', assertMost);
  
    /**
     * ### .within(start, finish)
     *
     * Asserts that the target is within a range.
     *
     *     expect(7).to.be.within(5,10);
     *
     * Can also be used in conjunction with `length` to
     * assert a length range. The benefit being a
     * more informative error message than if the length
     * was supplied directly.
     *
     *     expect('foo').to.have.length.within(2,4);
     *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
     *
     * @name within
     * @param {Number} start lowerbound inclusive
     * @param {Number} finish upperbound inclusive
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    Assertion.addMethod('within', function (start, finish, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object')
        , range = start + '..' + finish;
      if (flag(this, 'doLength')) {
        new Assertion(obj, msg).to.have.property('length');
        var len = obj.length;
        this.assert(
            len >= start && len <= finish
          , 'expected #{this} to have a length within ' + range
          , 'expected #{this} to not have a length within ' + range
        );
      } else {
        this.assert(
            obj >= start && obj <= finish
          , 'expected #{this} to be within ' + range
          , 'expected #{this} to not be within ' + range
        );
      }
    });
  
    /**
     * ### .instanceof(constructor)
     *
     * Asserts that the target is an instance of `constructor`.
     *
     *     var Tea = function (name) { this.name = name; }
     *       , Chai = new Tea('chai');
     *
     *     expect(Chai).to.be.an.instanceof(Tea);
     *     expect([ 1, 2, 3 ]).to.be.instanceof(Array);
     *
     * @name instanceof
     * @param {Constructor} constructor
     * @param {String} message _optional_
     * @alias instanceOf
     * @namespace BDD
     * @api public
     */
  
    function assertInstanceOf (constructor, msg) {
      if (msg) flag(this, 'message', msg);
      var name = _.getName(constructor);
      this.assert(
          flag(this, 'object') instanceof constructor
        , 'expected #{this} to be an instance of ' + name
        , 'expected #{this} to not be an instance of ' + name
      );
    };
  
    Assertion.addMethod('instanceof', assertInstanceOf);
    Assertion.addMethod('instanceOf', assertInstanceOf);
  
    /**
     * ### .property(name, [value])
     *
     * Asserts that the target has a property `name`, optionally asserting that
     * the value of that property is strictly equal to  `value`.
     * If the `deep` flag is set, you can use dot- and bracket-notation for deep
     * references into objects and arrays.
     *
     *     // simple referencing
     *     var obj = { foo: 'bar' };
     *     expect(obj).to.have.property('foo');
     *     expect(obj).to.have.property('foo', 'bar');
     *
     *     // deep referencing
     *     var deepObj = {
     *         green: { tea: 'matcha' }
     *       , teas: [ 'chai', 'matcha', { tea: 'konacha' } ]
     *     };
     *
     *     expect(deepObj).to.have.deep.property('green.tea', 'matcha');
     *     expect(deepObj).to.have.deep.property('teas[1]', 'matcha');
     *     expect(deepObj).to.have.deep.property('teas[2].tea', 'konacha');
     *
     * You can also use an array as the starting point of a `deep.property`
     * assertion, or traverse nested arrays.
     *
     *     var arr = [
     *         [ 'chai', 'matcha', 'konacha' ]
     *       , [ { tea: 'chai' }
     *         , { tea: 'matcha' }
     *         , { tea: 'konacha' } ]
     *     ];
     *
     *     expect(arr).to.have.deep.property('[0][1]', 'matcha');
     *     expect(arr).to.have.deep.property('[1][2].tea', 'konacha');
     *
     * Furthermore, `property` changes the subject of the assertion
     * to be the value of that property from the original object. This
     * permits for further chainable assertions on that property.
     *
     *     expect(obj).to.have.property('foo')
     *       .that.is.a('string');
     *     expect(deepObj).to.have.property('green')
     *       .that.is.an('object')
     *       .that.deep.equals({ tea: 'matcha' });
     *     expect(deepObj).to.have.property('teas')
     *       .that.is.an('array')
     *       .with.deep.property('[2]')
     *         .that.deep.equals({ tea: 'konacha' });
     *
     * Note that dots and bracket in `name` must be backslash-escaped when
     * the `deep` flag is set, while they must NOT be escaped when the `deep`
     * flag is not set.
     *
     *     // simple referencing
     *     var css = { '.link[target]': 42 };
     *     expect(css).to.have.property('.link[target]', 42);
     *
     *     // deep referencing
     *     var deepCss = { '.link': { '[target]': 42 }};
     *     expect(deepCss).to.have.deep.property('\\.link.\\[target\\]', 42);
     *
     * @name property
     * @alias deep.property
     * @param {String} name
     * @param {Mixed} value (optional)
     * @param {String} message _optional_
     * @returns value of property for chaining
     * @namespace BDD
     * @api public
     */
  
    Assertion.addMethod('property', function (name, val, msg) {
      if (msg) flag(this, 'message', msg);
  
      var isDeep = !!flag(this, 'deep')
        , descriptor = isDeep ? 'deep property ' : 'property '
        , negate = flag(this, 'negate')
        , obj = flag(this, 'object')
        , pathInfo = isDeep ? _.getPathInfo(name, obj) : null
        , hasProperty = isDeep
          ? pathInfo.exists
          : _.hasProperty(name, obj)
        , value = isDeep
          ? pathInfo.value
          : obj[name];
  
      if (negate && arguments.length > 1) {
        if (undefined === value) {
          msg = (msg != null) ? msg + ': ' : '';
          throw new Error(msg + _.inspect(obj) + ' has no ' + descriptor + _.inspect(name));
        }
      } else {
        this.assert(
            hasProperty
          , 'expected #{this} to have a ' + descriptor + _.inspect(name)
          , 'expected #{this} to not have ' + descriptor + _.inspect(name));
      }
  
      if (arguments.length > 1) {
        this.assert(
            val === value
          , 'expected #{this} to have a ' + descriptor + _.inspect(name) + ' of #{exp}, but got #{act}'
          , 'expected #{this} to not have a ' + descriptor + _.inspect(name) + ' of #{act}'
          , val
          , value
        );
      }
  
      flag(this, 'object', value);
    });
  
  
    /**
     * ### .ownProperty(name)
     *
     * Asserts that the target has an own property `name`.
     *
     *     expect('test').to.have.ownProperty('length');
     *
     * @name ownProperty
     * @alias haveOwnProperty
     * @param {String} name
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertOwnProperty (name, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      this.assert(
          obj.hasOwnProperty(name)
        , 'expected #{this} to have own property ' + _.inspect(name)
        , 'expected #{this} to not have own property ' + _.inspect(name)
      );
    }
  
    Assertion.addMethod('ownProperty', assertOwnProperty);
    Assertion.addMethod('haveOwnProperty', assertOwnProperty);
  
    /**
     * ### .ownPropertyDescriptor(name[, descriptor[, message]])
     *
     * Asserts that the target has an own property descriptor `name`, that optionally matches `descriptor`.
     *
     *     expect('test').to.have.ownPropertyDescriptor('length');
     *     expect('test').to.have.ownPropertyDescriptor('length', { enumerable: false, configurable: false, writable: false, value: 4 });
     *     expect('test').not.to.have.ownPropertyDescriptor('length', { enumerable: false, configurable: false, writable: false, value: 3 });
     *     expect('test').ownPropertyDescriptor('length').to.have.property('enumerable', false);
     *     expect('test').ownPropertyDescriptor('length').to.have.keys('value');
     *
     * @name ownPropertyDescriptor
     * @alias haveOwnPropertyDescriptor
     * @param {String} name
     * @param {Object} descriptor _optional_
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertOwnPropertyDescriptor (name, descriptor, msg) {
      if (typeof descriptor === 'string') {
        msg = descriptor;
        descriptor = null;
      }
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      var actualDescriptor = Object.getOwnPropertyDescriptor(Object(obj), name);
      if (actualDescriptor && descriptor) {
        this.assert(
            _.eql(descriptor, actualDescriptor)
          , 'expected the own property descriptor for ' + _.inspect(name) + ' on #{this} to match ' + _.inspect(descriptor) + ', got ' + _.inspect(actualDescriptor)
          , 'expected the own property descriptor for ' + _.inspect(name) + ' on #{this} to not match ' + _.inspect(descriptor)
          , descriptor
          , actualDescriptor
          , true
        );
      } else {
        this.assert(
            actualDescriptor
          , 'expected #{this} to have an own property descriptor for ' + _.inspect(name)
          , 'expected #{this} to not have an own property descriptor for ' + _.inspect(name)
        );
      }
      flag(this, 'object', actualDescriptor);
    }
  
    Assertion.addMethod('ownPropertyDescriptor', assertOwnPropertyDescriptor);
    Assertion.addMethod('haveOwnPropertyDescriptor', assertOwnPropertyDescriptor);
  
    /**
     * ### .length
     *
     * Sets the `doLength` flag later used as a chain precursor to a value
     * comparison for the `length` property.
     *
     *     expect('foo').to.have.length.above(2);
     *     expect([ 1, 2, 3 ]).to.have.length.above(2);
     *     expect('foo').to.have.length.below(4);
     *     expect([ 1, 2, 3 ]).to.have.length.below(4);
     *     expect('foo').to.have.length.within(2,4);
     *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
     *
     * *Deprecation notice:* Using `length` as an assertion will be deprecated
     * in version 2.4.0 and removed in 3.0.0. Code using the old style of
     * asserting for `length` property value using `length(value)` should be
     * switched to use `lengthOf(value)` instead.
     *
     * @name length
     * @namespace BDD
     * @api public
     */
  
    /**
     * ### .lengthOf(value[, message])
     *
     * Asserts that the target's `length` property has
     * the expected value.
     *
     *     expect([ 1, 2, 3]).to.have.lengthOf(3);
     *     expect('foobar').to.have.lengthOf(6);
     *
     * @name lengthOf
     * @param {Number} length
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertLengthChain () {
      flag(this, 'doLength', true);
    }
  
    function assertLength (n, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      new Assertion(obj, msg).to.have.property('length');
      var len = obj.length;
  
      this.assert(
          len == n
        , 'expected #{this} to have a length of #{exp} but got #{act}'
        , 'expected #{this} to not have a length of #{act}'
        , n
        , len
      );
    }
  
    Assertion.addChainableMethod('length', assertLength, assertLengthChain);
    Assertion.addMethod('lengthOf', assertLength);
  
    /**
     * ### .match(regexp)
     *
     * Asserts that the target matches a regular expression.
     *
     *     expect('foobar').to.match(/^foo/);
     *
     * @name match
     * @alias matches
     * @param {RegExp} RegularExpression
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
    function assertMatch(re, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      this.assert(
          re.exec(obj)
        , 'expected #{this} to match ' + re
        , 'expected #{this} not to match ' + re
      );
    }
  
    Assertion.addMethod('match', assertMatch);
    Assertion.addMethod('matches', assertMatch);
  
    /**
     * ### .string(string)
     *
     * Asserts that the string target contains another string.
     *
     *     expect('foobar').to.have.string('bar');
     *
     * @name string
     * @param {String} string
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    Assertion.addMethod('string', function (str, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      new Assertion(obj, msg).is.a('string');
  
      this.assert(
          ~obj.indexOf(str)
        , 'expected #{this} to contain ' + _.inspect(str)
        , 'expected #{this} to not contain ' + _.inspect(str)
      );
    });
  
  
    /**
     * ### .keys(key1, [key2], [...])
     *
     * Asserts that the target contains any or all of the passed-in keys.
     * Use in combination with `any`, `all`, `contains`, or `have` will affect
     * what will pass.
     *
     * When used in conjunction with `any`, at least one key that is passed
     * in must exist in the target object. This is regardless whether or not
     * the `have` or `contain` qualifiers are used. Note, either `any` or `all`
     * should be used in the assertion. If neither are used, the assertion is
     * defaulted to `all`.
     *
     * When both `all` and `contain` are used, the target object must have at
     * least all of the passed-in keys but may have more keys not listed.
     *
     * When both `all` and `have` are used, the target object must both contain
     * all of the passed-in keys AND the number of keys in the target object must
     * match the number of keys passed in (in other words, a target object must
     * have all and only all of the passed-in keys).
     *
     *     expect({ foo: 1, bar: 2 }).to.have.any.keys('foo', 'baz');
     *     expect({ foo: 1, bar: 2 }).to.have.any.keys('foo');
     *     expect({ foo: 1, bar: 2 }).to.contain.any.keys('bar', 'baz');
     *     expect({ foo: 1, bar: 2 }).to.contain.any.keys(['foo']);
     *     expect({ foo: 1, bar: 2 }).to.contain.any.keys({'foo': 6});
     *     expect({ foo: 1, bar: 2 }).to.have.all.keys(['bar', 'foo']);
     *     expect({ foo: 1, bar: 2 }).to.have.all.keys({'bar': 6, 'foo': 7});
     *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.all.keys(['bar', 'foo']);
     *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.all.keys({'bar': 6});
     *
     *
     * @name keys
     * @alias key
     * @param {...String|Array|Object} keys
     * @namespace BDD
     * @api public
     */
  
    function assertKeys (keys) {
      var obj = flag(this, 'object')
        , str
        , ok = true
        , mixedArgsMsg = 'keys must be given single argument of Array|Object|String, or multiple String arguments';
  
      switch (_.type(keys)) {
        case "array":
          if (arguments.length > 1) throw (new Error(mixedArgsMsg));
          break;
        case "object":
          if (arguments.length > 1) throw (new Error(mixedArgsMsg));
          keys = Object.keys(keys);
          break;
        default:
          keys = Array.prototype.slice.call(arguments);
      }
  
      if (!keys.length) throw new Error('keys required');
  
      var actual = Object.keys(obj)
        , expected = keys
        , len = keys.length
        , any = flag(this, 'any')
        , all = flag(this, 'all');
  
      if (!any && !all) {
        all = true;
      }
  
      // Has any
      if (any) {
        var intersection = expected.filter(function(key) {
          return ~actual.indexOf(key);
        });
        ok = intersection.length > 0;
      }
  
      // Has all
      if (all) {
        ok = keys.every(function(key){
          return ~actual.indexOf(key);
        });
        if (!flag(this, 'negate') && !flag(this, 'contains')) {
          ok = ok && keys.length == actual.length;
        }
      }
  
      // Key string
      if (len > 1) {
        keys = keys.map(function(key){
          return _.inspect(key);
        });
        var last = keys.pop();
        if (all) {
          str = keys.join(', ') + ', and ' + last;
        }
        if (any) {
          str = keys.join(', ') + ', or ' + last;
        }
      } else {
        str = _.inspect(keys[0]);
      }
  
      // Form
      str = (len > 1 ? 'keys ' : 'key ') + str;
  
      // Have / include
      str = (flag(this, 'contains') ? 'contain ' : 'have ') + str;
  
      // Assertion
      this.assert(
          ok
        , 'expected #{this} to ' + str
        , 'expected #{this} to not ' + str
        , expected.slice(0).sort()
        , actual.sort()
        , true
      );
    }
  
    Assertion.addMethod('keys', assertKeys);
    Assertion.addMethod('key', assertKeys);
  
    /**
     * ### .throw(constructor)
     *
     * Asserts that the function target will throw a specific error, or specific type of error
     * (as determined using `instanceof`), optionally with a RegExp or string inclusion test
     * for the error's message.
     *
     *     var err = new ReferenceError('This is a bad function.');
     *     var fn = function () { throw err; }
     *     expect(fn).to.throw(ReferenceError);
     *     expect(fn).to.throw(Error);
     *     expect(fn).to.throw(/bad function/);
     *     expect(fn).to.not.throw('good function');
     *     expect(fn).to.throw(ReferenceError, /bad function/);
     *     expect(fn).to.throw(err);
     *
     * Please note that when a throw expectation is negated, it will check each
     * parameter independently, starting with error constructor type. The appropriate way
     * to check for the existence of a type of error but for a message that does not match
     * is to use `and`.
     *
     *     expect(fn).to.throw(ReferenceError)
     *        .and.not.throw(/good function/);
     *
     * @name throw
     * @alias throws
     * @alias Throw
     * @param {ErrorConstructor} constructor
     * @param {String|RegExp} expected error message
     * @param {String} message _optional_
     * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
     * @returns error for chaining (null if no error)
     * @namespace BDD
     * @api public
     */
  
    function assertThrows (constructor, errMsg, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      new Assertion(obj, msg).is.a('function');
  
      var thrown = false
        , desiredError = null
        , name = null
        , thrownError = null;
  
      if (arguments.length === 0) {
        errMsg = null;
        constructor = null;
      } else if (constructor && (constructor instanceof RegExp || 'string' === typeof constructor)) {
        errMsg = constructor;
        constructor = null;
      } else if (constructor && constructor instanceof Error) {
        desiredError = constructor;
        constructor = null;
        errMsg = null;
      } else if (typeof constructor === 'function') {
        name = constructor.prototype.name;
        if (!name || (name === 'Error' && constructor !== Error)) {
          name = constructor.name || (new constructor()).name;
        }
      } else {
        constructor = null;
      }
  
      try {
        obj();
      } catch (err) {
        // first, check desired error
        if (desiredError) {
          this.assert(
              err === desiredError
            , 'expected #{this} to throw #{exp} but #{act} was thrown'
            , 'expected #{this} to not throw #{exp}'
            , (desiredError instanceof Error ? desiredError.toString() : desiredError)
            , (err instanceof Error ? err.toString() : err)
          );
  
          flag(this, 'object', err);
          return this;
        }
  
        // next, check constructor
        if (constructor) {
          this.assert(
              err instanceof constructor
            , 'expected #{this} to throw #{exp} but #{act} was thrown'
            , 'expected #{this} to not throw #{exp} but #{act} was thrown'
            , name
            , (err instanceof Error ? err.toString() : err)
          );
  
          if (!errMsg) {
            flag(this, 'object', err);
            return this;
          }
        }
  
        // next, check message
        var message = 'error' === _.type(err) && "message" in err
          ? err.message
          : '' + err;
  
        if ((message != null) && errMsg && errMsg instanceof RegExp) {
          this.assert(
              errMsg.exec(message)
            , 'expected #{this} to throw error matching #{exp} but got #{act}'
            , 'expected #{this} to throw error not matching #{exp}'
            , errMsg
            , message
          );
  
          flag(this, 'object', err);
          return this;
        } else if ((message != null) && errMsg && 'string' === typeof errMsg) {
          this.assert(
              ~message.indexOf(errMsg)
            , 'expected #{this} to throw error including #{exp} but got #{act}'
            , 'expected #{this} to throw error not including #{act}'
            , errMsg
            , message
          );
  
          flag(this, 'object', err);
          return this;
        } else {
          thrown = true;
          thrownError = err;
        }
      }
  
      var actuallyGot = ''
        , expectedThrown = name !== null
          ? name
          : desiredError
            ? '#{exp}' //_.inspect(desiredError)
            : 'an error';
  
      if (thrown) {
        actuallyGot = ' but #{act} was thrown'
      }
  
      this.assert(
          thrown === true
        , 'expected #{this} to throw ' + expectedThrown + actuallyGot
        , 'expected #{this} to not throw ' + expectedThrown + actuallyGot
        , (desiredError instanceof Error ? desiredError.toString() : desiredError)
        , (thrownError instanceof Error ? thrownError.toString() : thrownError)
      );
  
      flag(this, 'object', thrownError);
    };
  
    Assertion.addMethod('throw', assertThrows);
    Assertion.addMethod('throws', assertThrows);
    Assertion.addMethod('Throw', assertThrows);
  
    /**
     * ### .respondTo(method)
     *
     * Asserts that the object or class target will respond to a method.
     *
     *     Klass.prototype.bar = function(){};
     *     expect(Klass).to.respondTo('bar');
     *     expect(obj).to.respondTo('bar');
     *
     * To check if a constructor will respond to a static function,
     * set the `itself` flag.
     *
     *     Klass.baz = function(){};
     *     expect(Klass).itself.to.respondTo('baz');
     *
     * @name respondTo
     * @alias respondsTo
     * @param {String} method
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function respondTo (method, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object')
        , itself = flag(this, 'itself')
        , context = ('function' === _.type(obj) && !itself)
          ? obj.prototype[method]
          : obj[method];
  
      this.assert(
          'function' === typeof context
        , 'expected #{this} to respond to ' + _.inspect(method)
        , 'expected #{this} to not respond to ' + _.inspect(method)
      );
    }
  
    Assertion.addMethod('respondTo', respondTo);
    Assertion.addMethod('respondsTo', respondTo);
  
    /**
     * ### .itself
     *
     * Sets the `itself` flag, later used by the `respondTo` assertion.
     *
     *     function Foo() {}
     *     Foo.bar = function() {}
     *     Foo.prototype.baz = function() {}
     *
     *     expect(Foo).itself.to.respondTo('bar');
     *     expect(Foo).itself.not.to.respondTo('baz');
     *
     * @name itself
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('itself', function () {
      flag(this, 'itself', true);
    });
  
    /**
     * ### .satisfy(method)
     *
     * Asserts that the target passes a given truth test.
     *
     *     expect(1).to.satisfy(function(num) { return num > 0; });
     *
     * @name satisfy
     * @alias satisfies
     * @param {Function} matcher
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function satisfy (matcher, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
      var result = matcher(obj);
      this.assert(
          result
        , 'expected #{this} to satisfy ' + _.objDisplay(matcher)
        , 'expected #{this} to not satisfy' + _.objDisplay(matcher)
        , this.negate ? false : true
        , result
      );
    }
  
    Assertion.addMethod('satisfy', satisfy);
    Assertion.addMethod('satisfies', satisfy);
  
    /**
     * ### .closeTo(expected, delta)
     *
     * Asserts that the target is equal `expected`, to within a +/- `delta` range.
     *
     *     expect(1.5).to.be.closeTo(1, 0.5);
     *
     * @name closeTo
     * @alias approximately
     * @param {Number} expected
     * @param {Number} delta
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function closeTo(expected, delta, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
  
      new Assertion(obj, msg).is.a('number');
      if (_.type(expected) !== 'number' || _.type(delta) !== 'number') {
        throw new Error('the arguments to closeTo or approximately must be numbers');
      }
  
      this.assert(
          Math.abs(obj - expected) <= delta
        , 'expected #{this} to be close to ' + expected + ' +/- ' + delta
        , 'expected #{this} not to be close to ' + expected + ' +/- ' + delta
      );
    }
  
    Assertion.addMethod('closeTo', closeTo);
    Assertion.addMethod('approximately', closeTo);
  
    function isSubsetOf(subset, superset, cmp) {
      return subset.every(function(elem) {
        if (!cmp) return superset.indexOf(elem) !== -1;
  
        return superset.some(function(elem2) {
          return cmp(elem, elem2);
        });
      })
    }
  
    /**
     * ### .members(set)
     *
     * Asserts that the target is a superset of `set`,
     * or that the target and `set` have the same strictly-equal (===) members.
     * Alternately, if the `deep` flag is set, set members are compared for deep
     * equality.
     *
     *     expect([1, 2, 3]).to.include.members([3, 2]);
     *     expect([1, 2, 3]).to.not.include.members([3, 2, 8]);
     *
     *     expect([4, 2]).to.have.members([2, 4]);
     *     expect([5, 2]).to.not.have.members([5, 2, 1]);
     *
     *     expect([{ id: 1 }]).to.deep.include.members([{ id: 1 }]);
     *
     * @name members
     * @param {Array} set
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    Assertion.addMethod('members', function (subset, msg) {
      if (msg) flag(this, 'message', msg);
      var obj = flag(this, 'object');
  
      new Assertion(obj).to.be.an('array');
      new Assertion(subset).to.be.an('array');
  
      var cmp = flag(this, 'deep') ? _.eql : undefined;
  
      if (flag(this, 'contains')) {
        return this.assert(
            isSubsetOf(subset, obj, cmp)
          , 'expected #{this} to be a superset of #{act}'
          , 'expected #{this} to not be a superset of #{act}'
          , obj
          , subset
        );
      }
  
      this.assert(
          isSubsetOf(obj, subset, cmp) && isSubsetOf(subset, obj, cmp)
          , 'expected #{this} to have the same members as #{act}'
          , 'expected #{this} to not have the same members as #{act}'
          , obj
          , subset
      );
    });
  
    /**
     * ### .oneOf(list)
     *
     * Assert that a value appears somewhere in the top level of array `list`.
     *
     *     expect('a').to.be.oneOf(['a', 'b', 'c']);
     *     expect(9).to.not.be.oneOf(['z']);
     *     expect([3]).to.not.be.oneOf([1, 2, [3]]);
     *
     *     var three = [3];
     *     // for object-types, contents are not compared
     *     expect(three).to.not.be.oneOf([1, 2, [3]]);
     *     // comparing references works
     *     expect(three).to.be.oneOf([1, 2, three]);
     *
     * @name oneOf
     * @param {Array<*>} list
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function oneOf (list, msg) {
      if (msg) flag(this, 'message', msg);
      var expected = flag(this, 'object');
      new Assertion(list).to.be.an('array');
  
      this.assert(
          list.indexOf(expected) > -1
        , 'expected #{this} to be one of #{exp}'
        , 'expected #{this} to not be one of #{exp}'
        , list
        , expected
      );
    }
  
    Assertion.addMethod('oneOf', oneOf);
  
  
    /**
     * ### .change(function)
     *
     * Asserts that a function changes an object property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { obj.val += 3 };
     *     var noChangeFn = function() { return 'foo' + 'bar'; }
     *     expect(fn).to.change(obj, 'val');
     *     expect(noChangeFn).to.not.change(obj, 'val')
     *
     * @name change
     * @alias changes
     * @alias Change
     * @param {String} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertChanges (object, prop, msg) {
      if (msg) flag(this, 'message', msg);
      var fn = flag(this, 'object');
      new Assertion(object, msg).to.have.property(prop);
      new Assertion(fn).is.a('function');
  
      var initial = object[prop];
      fn();
  
      this.assert(
        initial !== object[prop]
        , 'expected .' + prop + ' to change'
        , 'expected .' + prop + ' to not change'
      );
    }
  
    Assertion.addChainableMethod('change', assertChanges);
    Assertion.addChainableMethod('changes', assertChanges);
  
    /**
     * ### .increase(function)
     *
     * Asserts that a function increases an object property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { obj.val = 15 };
     *     expect(fn).to.increase(obj, 'val');
     *
     * @name increase
     * @alias increases
     * @alias Increase
     * @param {String} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertIncreases (object, prop, msg) {
      if (msg) flag(this, 'message', msg);
      var fn = flag(this, 'object');
      new Assertion(object, msg).to.have.property(prop);
      new Assertion(fn).is.a('function');
  
      var initial = object[prop];
      fn();
  
      this.assert(
        object[prop] - initial > 0
        , 'expected .' + prop + ' to increase'
        , 'expected .' + prop + ' to not increase'
      );
    }
  
    Assertion.addChainableMethod('increase', assertIncreases);
    Assertion.addChainableMethod('increases', assertIncreases);
  
    /**
     * ### .decrease(function)
     *
     * Asserts that a function decreases an object property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { obj.val = 5 };
     *     expect(fn).to.decrease(obj, 'val');
     *
     * @name decrease
     * @alias decreases
     * @alias Decrease
     * @param {String} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace BDD
     * @api public
     */
  
    function assertDecreases (object, prop, msg) {
      if (msg) flag(this, 'message', msg);
      var fn = flag(this, 'object');
      new Assertion(object, msg).to.have.property(prop);
      new Assertion(fn).is.a('function');
  
      var initial = object[prop];
      fn();
  
      this.assert(
        object[prop] - initial < 0
        , 'expected .' + prop + ' to decrease'
        , 'expected .' + prop + ' to not decrease'
      );
    }
  
    Assertion.addChainableMethod('decrease', assertDecreases);
    Assertion.addChainableMethod('decreases', assertDecreases);
  
    /**
     * ### .extensible
     *
     * Asserts that the target is extensible (can have new properties added to
     * it).
     *
     *     var nonExtensibleObject = Object.preventExtensions({});
     *     var sealedObject = Object.seal({});
     *     var frozenObject = Object.freeze({});
     *
     *     expect({}).to.be.extensible;
     *     expect(nonExtensibleObject).to.not.be.extensible;
     *     expect(sealedObject).to.not.be.extensible;
     *     expect(frozenObject).to.not.be.extensible;
     *
     * @name extensible
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('extensible', function() {
      var obj = flag(this, 'object');
  
      // In ES5, if the argument to this method is not an object (a primitive), then it will cause a TypeError.
      // In ES6, a non-object argument will be treated as if it was a non-extensible ordinary object, simply return false.
      // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible
      // The following provides ES6 behavior when a TypeError is thrown under ES5.
  
      var isExtensible;
  
      try {
        isExtensible = Object.isExtensible(obj);
      } catch (err) {
        if (err instanceof TypeError) isExtensible = false;
        else throw err;
      }
  
      this.assert(
        isExtensible
        , 'expected #{this} to be extensible'
        , 'expected #{this} to not be extensible'
      );
    });
  
    /**
     * ### .sealed
     *
     * Asserts that the target is sealed (cannot have new properties added to it
     * and its existing properties cannot be removed).
     *
     *     var sealedObject = Object.seal({});
     *     var frozenObject = Object.freeze({});
     *
     *     expect(sealedObject).to.be.sealed;
     *     expect(frozenObject).to.be.sealed;
     *     expect({}).to.not.be.sealed;
     *
     * @name sealed
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('sealed', function() {
      var obj = flag(this, 'object');
  
      // In ES5, if the argument to this method is not an object (a primitive), then it will cause a TypeError.
      // In ES6, a non-object argument will be treated as if it was a sealed ordinary object, simply return true.
      // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed
      // The following provides ES6 behavior when a TypeError is thrown under ES5.
  
      var isSealed;
  
      try {
        isSealed = Object.isSealed(obj);
      } catch (err) {
        if (err instanceof TypeError) isSealed = true;
        else throw err;
      }
  
      this.assert(
        isSealed
        , 'expected #{this} to be sealed'
        , 'expected #{this} to not be sealed'
      );
    });
  
    /**
     * ### .frozen
     *
     * Asserts that the target is frozen (cannot have new properties added to it
     * and its existing properties cannot be modified).
     *
     *     var frozenObject = Object.freeze({});
     *
     *     expect(frozenObject).to.be.frozen;
     *     expect({}).to.not.be.frozen;
     *
     * @name frozen
     * @namespace BDD
     * @api public
     */
  
    Assertion.addProperty('frozen', function() {
      var obj = flag(this, 'object');
  
      // In ES5, if the argument to this method is not an object (a primitive), then it will cause a TypeError.
      // In ES6, a non-object argument will be treated as if it was a frozen ordinary object, simply return true.
      // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen
      // The following provides ES6 behavior when a TypeError is thrown under ES5.
  
      var isFrozen;
  
      try {
        isFrozen = Object.isFrozen(obj);
      } catch (err) {
        if (err instanceof TypeError) isFrozen = true;
        else throw err;
      }
  
      this.assert(
        isFrozen
        , 'expected #{this} to be frozen'
        , 'expected #{this} to not be frozen'
      );
    });
  };
  
  },{}],16:[function(require,module,exports){
  /*!
   * chai
   * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  
  module.exports = function (chai, util) {
  
    /*!
     * Chai dependencies.
     */
  
    var Assertion = chai.Assertion
      , flag = util.flag;
  
    /*!
     * Module export.
     */
  
    /**
     * ### assert(expression, message)
     *
     * Write your own test expressions.
     *
     *     assert('foo' !== 'bar', 'foo is not bar');
     *     assert(Array.isArray([]), 'empty arrays are arrays');
     *
     * @param {Mixed} expression to test for truthiness
     * @param {String} message to display on error
     * @name assert
     * @namespace Assert
     * @api public
     */
  
    var assert = chai.assert = function (express, errmsg) {
      var test = new Assertion(null, null, chai.assert);
      test.assert(
          express
        , errmsg
        , '[ negation message unavailable ]'
      );
    };
  
    /**
     * ### .fail(actual, expected, [message], [operator])
     *
     * Throw a failure. Node.js `assert` module-compatible.
     *
     * @name fail
     * @param {Mixed} actual
     * @param {Mixed} expected
     * @param {String} message
     * @param {String} operator
     * @namespace Assert
     * @api public
     */
  
    assert.fail = function (actual, expected, message, operator) {
      message = message || 'assert.fail()';
      throw new chai.AssertionError(message, {
          actual: actual
        , expected: expected
        , operator: operator
      }, assert.fail);
    };
  
    /**
     * ### .isOk(object, [message])
     *
     * Asserts that `object` is truthy.
     *
     *     assert.isOk('everything', 'everything is ok');
     *     assert.isOk(false, 'this will fail');
     *
     * @name isOk
     * @alias ok
     * @param {Mixed} object to test
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isOk = function (val, msg) {
      new Assertion(val, msg).is.ok;
    };
  
    /**
     * ### .isNotOk(object, [message])
     *
     * Asserts that `object` is falsy.
     *
     *     assert.isNotOk('everything', 'this will fail');
     *     assert.isNotOk(false, 'this will pass');
     *
     * @name isNotOk
     * @alias notOk
     * @param {Mixed} object to test
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotOk = function (val, msg) {
      new Assertion(val, msg).is.not.ok;
    };
  
    /**
     * ### .equal(actual, expected, [message])
     *
     * Asserts non-strict equality (`==`) of `actual` and `expected`.
     *
     *     assert.equal(3, '3', '== coerces values to strings');
     *
     * @name equal
     * @param {Mixed} actual
     * @param {Mixed} expected
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.equal = function (act, exp, msg) {
      var test = new Assertion(act, msg, assert.equal);
  
      test.assert(
          exp == flag(test, 'object')
        , 'expected #{this} to equal #{exp}'
        , 'expected #{this} to not equal #{act}'
        , exp
        , act
      );
    };
  
    /**
     * ### .notEqual(actual, expected, [message])
     *
     * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
     *
     *     assert.notEqual(3, 4, 'these numbers are not equal');
     *
     * @name notEqual
     * @param {Mixed} actual
     * @param {Mixed} expected
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notEqual = function (act, exp, msg) {
      var test = new Assertion(act, msg, assert.notEqual);
  
      test.assert(
          exp != flag(test, 'object')
        , 'expected #{this} to not equal #{exp}'
        , 'expected #{this} to equal #{act}'
        , exp
        , act
      );
    };
  
    /**
     * ### .strictEqual(actual, expected, [message])
     *
     * Asserts strict equality (`===`) of `actual` and `expected`.
     *
     *     assert.strictEqual(true, true, 'these booleans are strictly equal');
     *
     * @name strictEqual
     * @param {Mixed} actual
     * @param {Mixed} expected
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.strictEqual = function (act, exp, msg) {
      new Assertion(act, msg).to.equal(exp);
    };
  
    /**
     * ### .notStrictEqual(actual, expected, [message])
     *
     * Asserts strict inequality (`!==`) of `actual` and `expected`.
     *
     *     assert.notStrictEqual(3, '3', 'no coercion for strict equality');
     *
     * @name notStrictEqual
     * @param {Mixed} actual
     * @param {Mixed} expected
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notStrictEqual = function (act, exp, msg) {
      new Assertion(act, msg).to.not.equal(exp);
    };
  
    /**
     * ### .deepEqual(actual, expected, [message])
     *
     * Asserts that `actual` is deeply equal to `expected`.
     *
     *     assert.deepEqual({ tea: 'green' }, { tea: 'green' });
     *
     * @name deepEqual
     * @param {Mixed} actual
     * @param {Mixed} expected
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.deepEqual = function (act, exp, msg) {
      new Assertion(act, msg).to.eql(exp);
    };
  
    /**
     * ### .notDeepEqual(actual, expected, [message])
     *
     * Assert that `actual` is not deeply equal to `expected`.
     *
     *     assert.notDeepEqual({ tea: 'green' }, { tea: 'jasmine' });
     *
     * @name notDeepEqual
     * @param {Mixed} actual
     * @param {Mixed} expected
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notDeepEqual = function (act, exp, msg) {
      new Assertion(act, msg).to.not.eql(exp);
    };
  
     /**
     * ### .isAbove(valueToCheck, valueToBeAbove, [message])
     *
     * Asserts `valueToCheck` is strictly greater than (>) `valueToBeAbove`
     *
     *     assert.isAbove(5, 2, '5 is strictly greater than 2');
     *
     * @name isAbove
     * @param {Mixed} valueToCheck
     * @param {Mixed} valueToBeAbove
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isAbove = function (val, abv, msg) {
      new Assertion(val, msg).to.be.above(abv);
    };
  
     /**
     * ### .isAtLeast(valueToCheck, valueToBeAtLeast, [message])
     *
     * Asserts `valueToCheck` is greater than or equal to (>=) `valueToBeAtLeast`
     *
     *     assert.isAtLeast(5, 2, '5 is greater or equal to 2');
     *     assert.isAtLeast(3, 3, '3 is greater or equal to 3');
     *
     * @name isAtLeast
     * @param {Mixed} valueToCheck
     * @param {Mixed} valueToBeAtLeast
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isAtLeast = function (val, atlst, msg) {
      new Assertion(val, msg).to.be.least(atlst);
    };
  
     /**
     * ### .isBelow(valueToCheck, valueToBeBelow, [message])
     *
     * Asserts `valueToCheck` is strictly less than (<) `valueToBeBelow`
     *
     *     assert.isBelow(3, 6, '3 is strictly less than 6');
     *
     * @name isBelow
     * @param {Mixed} valueToCheck
     * @param {Mixed} valueToBeBelow
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isBelow = function (val, blw, msg) {
      new Assertion(val, msg).to.be.below(blw);
    };
  
     /**
     * ### .isAtMost(valueToCheck, valueToBeAtMost, [message])
     *
     * Asserts `valueToCheck` is less than or equal to (<=) `valueToBeAtMost`
     *
     *     assert.isAtMost(3, 6, '3 is less than or equal to 6');
     *     assert.isAtMost(4, 4, '4 is less than or equal to 4');
     *
     * @name isAtMost
     * @param {Mixed} valueToCheck
     * @param {Mixed} valueToBeAtMost
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isAtMost = function (val, atmst, msg) {
      new Assertion(val, msg).to.be.most(atmst);
    };
  
    /**
     * ### .isTrue(value, [message])
     *
     * Asserts that `value` is true.
     *
     *     var teaServed = true;
     *     assert.isTrue(teaServed, 'the tea has been served');
     *
     * @name isTrue
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isTrue = function (val, msg) {
      new Assertion(val, msg).is['true'];
    };
  
    /**
     * ### .isNotTrue(value, [message])
     *
     * Asserts that `value` is not true.
     *
     *     var tea = 'tasty chai';
     *     assert.isNotTrue(tea, 'great, time for tea!');
     *
     * @name isNotTrue
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotTrue = function (val, msg) {
      new Assertion(val, msg).to.not.equal(true);
    };
  
    /**
     * ### .isFalse(value, [message])
     *
     * Asserts that `value` is false.
     *
     *     var teaServed = false;
     *     assert.isFalse(teaServed, 'no tea yet? hmm...');
     *
     * @name isFalse
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isFalse = function (val, msg) {
      new Assertion(val, msg).is['false'];
    };
  
    /**
     * ### .isNotFalse(value, [message])
     *
     * Asserts that `value` is not false.
     *
     *     var tea = 'tasty chai';
     *     assert.isNotFalse(tea, 'great, time for tea!');
     *
     * @name isNotFalse
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotFalse = function (val, msg) {
      new Assertion(val, msg).to.not.equal(false);
    };
  
    /**
     * ### .isNull(value, [message])
     *
     * Asserts that `value` is null.
     *
     *     assert.isNull(err, 'there was no error');
     *
     * @name isNull
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNull = function (val, msg) {
      new Assertion(val, msg).to.equal(null);
    };
  
    /**
     * ### .isNotNull(value, [message])
     *
     * Asserts that `value` is not null.
     *
     *     var tea = 'tasty chai';
     *     assert.isNotNull(tea, 'great, time for tea!');
     *
     * @name isNotNull
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotNull = function (val, msg) {
      new Assertion(val, msg).to.not.equal(null);
    };
  
    /**
     * ### .isNaN
     * Asserts that value is NaN
     *
     *    assert.isNaN('foo', 'foo is NaN');
     *
     * @name isNaN
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNaN = function (val, msg) {
      new Assertion(val, msg).to.be.NaN;
    };
  
    /**
     * ### .isNotNaN
     * Asserts that value is not NaN
     *
     *    assert.isNotNaN(4, '4 is not NaN');
     *
     * @name isNotNaN
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
    assert.isNotNaN = function (val, msg) {
      new Assertion(val, msg).not.to.be.NaN;
    };
  
    /**
     * ### .isUndefined(value, [message])
     *
     * Asserts that `value` is `undefined`.
     *
     *     var tea;
     *     assert.isUndefined(tea, 'no tea defined');
     *
     * @name isUndefined
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isUndefined = function (val, msg) {
      new Assertion(val, msg).to.equal(undefined);
    };
  
    /**
     * ### .isDefined(value, [message])
     *
     * Asserts that `value` is not `undefined`.
     *
     *     var tea = 'cup of chai';
     *     assert.isDefined(tea, 'tea has been defined');
     *
     * @name isDefined
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isDefined = function (val, msg) {
      new Assertion(val, msg).to.not.equal(undefined);
    };
  
    /**
     * ### .isFunction(value, [message])
     *
     * Asserts that `value` is a function.
     *
     *     function serveTea() { return 'cup of tea'; };
     *     assert.isFunction(serveTea, 'great, we can have tea now');
     *
     * @name isFunction
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isFunction = function (val, msg) {
      new Assertion(val, msg).to.be.a('function');
    };
  
    /**
     * ### .isNotFunction(value, [message])
     *
     * Asserts that `value` is _not_ a function.
     *
     *     var serveTea = [ 'heat', 'pour', 'sip' ];
     *     assert.isNotFunction(serveTea, 'great, we have listed the steps');
     *
     * @name isNotFunction
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotFunction = function (val, msg) {
      new Assertion(val, msg).to.not.be.a('function');
    };
  
    /**
     * ### .isObject(value, [message])
     *
     * Asserts that `value` is an object of type 'Object' (as revealed by `Object.prototype.toString`).
     * _The assertion does not match subclassed objects._
     *
     *     var selection = { name: 'Chai', serve: 'with spices' };
     *     assert.isObject(selection, 'tea selection is an object');
     *
     * @name isObject
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isObject = function (val, msg) {
      new Assertion(val, msg).to.be.a('object');
    };
  
    /**
     * ### .isNotObject(value, [message])
     *
     * Asserts that `value` is _not_ an object of type 'Object' (as revealed by `Object.prototype.toString`).
     *
     *     var selection = 'chai'
     *     assert.isNotObject(selection, 'tea selection is not an object');
     *     assert.isNotObject(null, 'null is not an object');
     *
     * @name isNotObject
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotObject = function (val, msg) {
      new Assertion(val, msg).to.not.be.a('object');
    };
  
    /**
     * ### .isArray(value, [message])
     *
     * Asserts that `value` is an array.
     *
     *     var menu = [ 'green', 'chai', 'oolong' ];
     *     assert.isArray(menu, 'what kind of tea do we want?');
     *
     * @name isArray
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isArray = function (val, msg) {
      new Assertion(val, msg).to.be.an('array');
    };
  
    /**
     * ### .isNotArray(value, [message])
     *
     * Asserts that `value` is _not_ an array.
     *
     *     var menu = 'green|chai|oolong';
     *     assert.isNotArray(menu, 'what kind of tea do we want?');
     *
     * @name isNotArray
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotArray = function (val, msg) {
      new Assertion(val, msg).to.not.be.an('array');
    };
  
    /**
     * ### .isString(value, [message])
     *
     * Asserts that `value` is a string.
     *
     *     var teaOrder = 'chai';
     *     assert.isString(teaOrder, 'order placed');
     *
     * @name isString
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isString = function (val, msg) {
      new Assertion(val, msg).to.be.a('string');
    };
  
    /**
     * ### .isNotString(value, [message])
     *
     * Asserts that `value` is _not_ a string.
     *
     *     var teaOrder = 4;
     *     assert.isNotString(teaOrder, 'order placed');
     *
     * @name isNotString
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotString = function (val, msg) {
      new Assertion(val, msg).to.not.be.a('string');
    };
  
    /**
     * ### .isNumber(value, [message])
     *
     * Asserts that `value` is a number.
     *
     *     var cups = 2;
     *     assert.isNumber(cups, 'how many cups');
     *
     * @name isNumber
     * @param {Number} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNumber = function (val, msg) {
      new Assertion(val, msg).to.be.a('number');
    };
  
    /**
     * ### .isNotNumber(value, [message])
     *
     * Asserts that `value` is _not_ a number.
     *
     *     var cups = '2 cups please';
     *     assert.isNotNumber(cups, 'how many cups');
     *
     * @name isNotNumber
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotNumber = function (val, msg) {
      new Assertion(val, msg).to.not.be.a('number');
    };
  
    /**
     * ### .isBoolean(value, [message])
     *
     * Asserts that `value` is a boolean.
     *
     *     var teaReady = true
     *       , teaServed = false;
     *
     *     assert.isBoolean(teaReady, 'is the tea ready');
     *     assert.isBoolean(teaServed, 'has tea been served');
     *
     * @name isBoolean
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isBoolean = function (val, msg) {
      new Assertion(val, msg).to.be.a('boolean');
    };
  
    /**
     * ### .isNotBoolean(value, [message])
     *
     * Asserts that `value` is _not_ a boolean.
     *
     *     var teaReady = 'yep'
     *       , teaServed = 'nope';
     *
     *     assert.isNotBoolean(teaReady, 'is the tea ready');
     *     assert.isNotBoolean(teaServed, 'has tea been served');
     *
     * @name isNotBoolean
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.isNotBoolean = function (val, msg) {
      new Assertion(val, msg).to.not.be.a('boolean');
    };
  
    /**
     * ### .typeOf(value, name, [message])
     *
     * Asserts that `value`'s type is `name`, as determined by
     * `Object.prototype.toString`.
     *
     *     assert.typeOf({ tea: 'chai' }, 'object', 'we have an object');
     *     assert.typeOf(['chai', 'jasmine'], 'array', 'we have an array');
     *     assert.typeOf('tea', 'string', 'we have a string');
     *     assert.typeOf(/tea/, 'regexp', 'we have a regular expression');
     *     assert.typeOf(null, 'null', 'we have a null');
     *     assert.typeOf(undefined, 'undefined', 'we have an undefined');
     *
     * @name typeOf
     * @param {Mixed} value
     * @param {String} name
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.typeOf = function (val, type, msg) {
      new Assertion(val, msg).to.be.a(type);
    };
  
    /**
     * ### .notTypeOf(value, name, [message])
     *
     * Asserts that `value`'s type is _not_ `name`, as determined by
     * `Object.prototype.toString`.
     *
     *     assert.notTypeOf('tea', 'number', 'strings are not numbers');
     *
     * @name notTypeOf
     * @param {Mixed} value
     * @param {String} typeof name
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notTypeOf = function (val, type, msg) {
      new Assertion(val, msg).to.not.be.a(type);
    };
  
    /**
     * ### .instanceOf(object, constructor, [message])
     *
     * Asserts that `value` is an instance of `constructor`.
     *
     *     var Tea = function (name) { this.name = name; }
     *       , chai = new Tea('chai');
     *
     *     assert.instanceOf(chai, Tea, 'chai is an instance of tea');
     *
     * @name instanceOf
     * @param {Object} object
     * @param {Constructor} constructor
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.instanceOf = function (val, type, msg) {
      new Assertion(val, msg).to.be.instanceOf(type);
    };
  
    /**
     * ### .notInstanceOf(object, constructor, [message])
     *
     * Asserts `value` is not an instance of `constructor`.
     *
     *     var Tea = function (name) { this.name = name; }
     *       , chai = new String('chai');
     *
     *     assert.notInstanceOf(chai, Tea, 'chai is not an instance of tea');
     *
     * @name notInstanceOf
     * @param {Object} object
     * @param {Constructor} constructor
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notInstanceOf = function (val, type, msg) {
      new Assertion(val, msg).to.not.be.instanceOf(type);
    };
  
    /**
     * ### .include(haystack, needle, [message])
     *
     * Asserts that `haystack` includes `needle`. Works
     * for strings and arrays.
     *
     *     assert.include('foobar', 'bar', 'foobar contains string "bar"');
     *     assert.include([ 1, 2, 3 ], 3, 'array contains value');
     *
     * @name include
     * @param {Array|String} haystack
     * @param {Mixed} needle
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.include = function (exp, inc, msg) {
      new Assertion(exp, msg, assert.include).include(inc);
    };
  
    /**
     * ### .notInclude(haystack, needle, [message])
     *
     * Asserts that `haystack` does not include `needle`. Works
     * for strings and arrays.
     *
     *     assert.notInclude('foobar', 'baz', 'string not include substring');
     *     assert.notInclude([ 1, 2, 3 ], 4, 'array not include contain value');
     *
     * @name notInclude
     * @param {Array|String} haystack
     * @param {Mixed} needle
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notInclude = function (exp, inc, msg) {
      new Assertion(exp, msg, assert.notInclude).not.include(inc);
    };
  
    /**
     * ### .match(value, regexp, [message])
     *
     * Asserts that `value` matches the regular expression `regexp`.
     *
     *     assert.match('foobar', /^foo/, 'regexp matches');
     *
     * @name match
     * @param {Mixed} value
     * @param {RegExp} regexp
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.match = function (exp, re, msg) {
      new Assertion(exp, msg).to.match(re);
    };
  
    /**
     * ### .notMatch(value, regexp, [message])
     *
     * Asserts that `value` does not match the regular expression `regexp`.
     *
     *     assert.notMatch('foobar', /^foo/, 'regexp does not match');
     *
     * @name notMatch
     * @param {Mixed} value
     * @param {RegExp} regexp
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notMatch = function (exp, re, msg) {
      new Assertion(exp, msg).to.not.match(re);
    };
  
    /**
     * ### .property(object, property, [message])
     *
     * Asserts that `object` has a property named by `property`.
     *
     *     assert.property({ tea: { green: 'matcha' }}, 'tea');
     *
     * @name property
     * @param {Object} object
     * @param {String} property
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.property = function (obj, prop, msg) {
      new Assertion(obj, msg).to.have.property(prop);
    };
  
    /**
     * ### .notProperty(object, property, [message])
     *
     * Asserts that `object` does _not_ have a property named by `property`.
     *
     *     assert.notProperty({ tea: { green: 'matcha' }}, 'coffee');
     *
     * @name notProperty
     * @param {Object} object
     * @param {String} property
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notProperty = function (obj, prop, msg) {
      new Assertion(obj, msg).to.not.have.property(prop);
    };
  
    /**
     * ### .deepProperty(object, property, [message])
     *
     * Asserts that `object` has a property named by `property`, which can be a
     * string using dot- and bracket-notation for deep reference.
     *
     *     assert.deepProperty({ tea: { green: 'matcha' }}, 'tea.green');
     *
     * @name deepProperty
     * @param {Object} object
     * @param {String} property
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.deepProperty = function (obj, prop, msg) {
      new Assertion(obj, msg).to.have.deep.property(prop);
    };
  
    /**
     * ### .notDeepProperty(object, property, [message])
     *
     * Asserts that `object` does _not_ have a property named by `property`, which
     * can be a string using dot- and bracket-notation for deep reference.
     *
     *     assert.notDeepProperty({ tea: { green: 'matcha' }}, 'tea.oolong');
     *
     * @name notDeepProperty
     * @param {Object} object
     * @param {String} property
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.notDeepProperty = function (obj, prop, msg) {
      new Assertion(obj, msg).to.not.have.deep.property(prop);
    };
  
    /**
     * ### .propertyVal(object, property, value, [message])
     *
     * Asserts that `object` has a property named by `property` with value given
     * by `value`.
     *
     *     assert.propertyVal({ tea: 'is good' }, 'tea', 'is good');
     *
     * @name propertyVal
     * @param {Object} object
     * @param {String} property
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.propertyVal = function (obj, prop, val, msg) {
      new Assertion(obj, msg).to.have.property(prop, val);
    };
  
    /**
     * ### .propertyNotVal(object, property, value, [message])
     *
     * Asserts that `object` has a property named by `property`, but with a value
     * different from that given by `value`.
     *
     *     assert.propertyNotVal({ tea: 'is good' }, 'tea', 'is bad');
     *
     * @name propertyNotVal
     * @param {Object} object
     * @param {String} property
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.propertyNotVal = function (obj, prop, val, msg) {
      new Assertion(obj, msg).to.not.have.property(prop, val);
    };
  
    /**
     * ### .deepPropertyVal(object, property, value, [message])
     *
     * Asserts that `object` has a property named by `property` with value given
     * by `value`. `property` can use dot- and bracket-notation for deep
     * reference.
     *
     *     assert.deepPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'matcha');
     *
     * @name deepPropertyVal
     * @param {Object} object
     * @param {String} property
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.deepPropertyVal = function (obj, prop, val, msg) {
      new Assertion(obj, msg).to.have.deep.property(prop, val);
    };
  
    /**
     * ### .deepPropertyNotVal(object, property, value, [message])
     *
     * Asserts that `object` has a property named by `property`, but with a value
     * different from that given by `value`. `property` can use dot- and
     * bracket-notation for deep reference.
     *
     *     assert.deepPropertyNotVal({ tea: { green: 'matcha' }}, 'tea.green', 'konacha');
     *
     * @name deepPropertyNotVal
     * @param {Object} object
     * @param {String} property
     * @param {Mixed} value
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.deepPropertyNotVal = function (obj, prop, val, msg) {
      new Assertion(obj, msg).to.not.have.deep.property(prop, val);
    };
  
    /**
     * ### .lengthOf(object, length, [message])
     *
     * Asserts that `object` has a `length` property with the expected value.
     *
     *     assert.lengthOf([1,2,3], 3, 'array has length of 3');
     *     assert.lengthOf('foobar', 6, 'string has length of 6');
     *
     * @name lengthOf
     * @param {Mixed} object
     * @param {Number} length
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.lengthOf = function (exp, len, msg) {
      new Assertion(exp, msg).to.have.length(len);
    };
  
    /**
     * ### .throws(function, [constructor/string/regexp], [string/regexp], [message])
     *
     * Asserts that `function` will throw an error that is an instance of
     * `constructor`, or alternately that it will throw an error with message
     * matching `regexp`.
     *
     *     assert.throws(fn, 'function throws a reference error');
     *     assert.throws(fn, /function throws a reference error/);
     *     assert.throws(fn, ReferenceError);
     *     assert.throws(fn, ReferenceError, 'function throws a reference error');
     *     assert.throws(fn, ReferenceError, /function throws a reference error/);
     *
     * @name throws
     * @alias throw
     * @alias Throw
     * @param {Function} function
     * @param {ErrorConstructor} constructor
     * @param {RegExp} regexp
     * @param {String} message
     * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
     * @namespace Assert
     * @api public
     */
  
    assert.throws = function (fn, errt, errs, msg) {
      if ('string' === typeof errt || errt instanceof RegExp) {
        errs = errt;
        errt = null;
      }
  
      var assertErr = new Assertion(fn, msg).to.throw(errt, errs);
      return flag(assertErr, 'object');
    };
  
    /**
     * ### .doesNotThrow(function, [constructor/regexp], [message])
     *
     * Asserts that `function` will _not_ throw an error that is an instance of
     * `constructor`, or alternately that it will not throw an error with message
     * matching `regexp`.
     *
     *     assert.doesNotThrow(fn, Error, 'function does not throw');
     *
     * @name doesNotThrow
     * @param {Function} function
     * @param {ErrorConstructor} constructor
     * @param {RegExp} regexp
     * @param {String} message
     * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
     * @namespace Assert
     * @api public
     */
  
    assert.doesNotThrow = function (fn, type, msg) {
      if ('string' === typeof type) {
        msg = type;
        type = null;
      }
  
      new Assertion(fn, msg).to.not.Throw(type);
    };
  
    /**
     * ### .operator(val1, operator, val2, [message])
     *
     * Compares two values using `operator`.
     *
     *     assert.operator(1, '<', 2, 'everything is ok');
     *     assert.operator(1, '>', 2, 'this will fail');
     *
     * @name operator
     * @param {Mixed} val1
     * @param {String} operator
     * @param {Mixed} val2
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.operator = function (val, operator, val2, msg) {
      var ok;
      switch(operator) {
        case '==':
          ok = val == val2;
          break;
        case '===':
          ok = val === val2;
          break;
        case '>':
          ok = val > val2;
          break;
        case '>=':
          ok = val >= val2;
          break;
        case '<':
          ok = val < val2;
          break;
        case '<=':
          ok = val <= val2;
          break;
        case '!=':
          ok = val != val2;
          break;
        case '!==':
          ok = val !== val2;
          break;
        default:
          throw new Error('Invalid operator "' + operator + '"');
      }
      var test = new Assertion(ok, msg);
      test.assert(
          true === flag(test, 'object')
        , 'expected ' + util.inspect(val) + ' to be ' + operator + ' ' + util.inspect(val2)
        , 'expected ' + util.inspect(val) + ' to not be ' + operator + ' ' + util.inspect(val2) );
    };
  
    /**
     * ### .closeTo(actual, expected, delta, [message])
     *
     * Asserts that the target is equal `expected`, to within a +/- `delta` range.
     *
     *     assert.closeTo(1.5, 1, 0.5, 'numbers are close');
     *
     * @name closeTo
     * @param {Number} actual
     * @param {Number} expected
     * @param {Number} delta
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.closeTo = function (act, exp, delta, msg) {
      new Assertion(act, msg).to.be.closeTo(exp, delta);
    };
  
    /**
     * ### .approximately(actual, expected, delta, [message])
     *
     * Asserts that the target is equal `expected`, to within a +/- `delta` range.
     *
     *     assert.approximately(1.5, 1, 0.5, 'numbers are close');
     *
     * @name approximately
     * @param {Number} actual
     * @param {Number} expected
     * @param {Number} delta
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.approximately = function (act, exp, delta, msg) {
      new Assertion(act, msg).to.be.approximately(exp, delta);
    };
  
    /**
     * ### .sameMembers(set1, set2, [message])
     *
     * Asserts that `set1` and `set2` have the same members.
     * Order is not taken into account.
     *
     *     assert.sameMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'same members');
     *
     * @name sameMembers
     * @param {Array} set1
     * @param {Array} set2
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.sameMembers = function (set1, set2, msg) {
      new Assertion(set1, msg).to.have.same.members(set2);
    }
  
    /**
     * ### .sameDeepMembers(set1, set2, [message])
     *
     * Asserts that `set1` and `set2` have the same members - using a deep equality checking.
     * Order is not taken into account.
     *
     *     assert.sameDeepMembers([ {b: 3}, {a: 2}, {c: 5} ], [ {c: 5}, {b: 3}, {a: 2} ], 'same deep members');
     *
     * @name sameDeepMembers
     * @param {Array} set1
     * @param {Array} set2
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.sameDeepMembers = function (set1, set2, msg) {
      new Assertion(set1, msg).to.have.same.deep.members(set2);
    }
  
    /**
     * ### .includeMembers(superset, subset, [message])
     *
     * Asserts that `subset` is included in `superset`.
     * Order is not taken into account.
     *
     *     assert.includeMembers([ 1, 2, 3 ], [ 2, 1 ], 'include members');
     *
     * @name includeMembers
     * @param {Array} superset
     * @param {Array} subset
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.includeMembers = function (superset, subset, msg) {
      new Assertion(superset, msg).to.include.members(subset);
    }
  
    /**
     * ### .includeDeepMembers(superset, subset, [message])
     *
     * Asserts that `subset` is included in `superset` - using deep equality checking.
     * Order is not taken into account.
     * Duplicates are ignored.
     *
     *     assert.includeDeepMembers([ {a: 1}, {b: 2}, {c: 3} ], [ {b: 2}, {a: 1}, {b: 2} ], 'include deep members');
     *
     * @name includeDeepMembers
     * @param {Array} superset
     * @param {Array} subset
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.includeDeepMembers = function (superset, subset, msg) {
      new Assertion(superset, msg).to.include.deep.members(subset);
    }
  
    /**
     * ### .oneOf(inList, list, [message])
     *
     * Asserts that non-object, non-array value `inList` appears in the flat array `list`.
     *
     *     assert.oneOf(1, [ 2, 1 ], 'Not found in list');
     *
     * @name oneOf
     * @param {*} inList
     * @param {Array<*>} list
     * @param {String} message
     * @namespace Assert
     * @api public
     */
  
    assert.oneOf = function (inList, list, msg) {
      new Assertion(inList, msg).to.be.oneOf(list);
    }
  
     /**
     * ### .changes(function, object, property)
     *
     * Asserts that a function changes the value of a property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { obj.val = 22 };
     *     assert.changes(fn, obj, 'val');
     *
     * @name changes
     * @param {Function} modifier function
     * @param {Object} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.changes = function (fn, obj, prop) {
      new Assertion(fn).to.change(obj, prop);
    }
  
     /**
     * ### .doesNotChange(function, object, property)
     *
     * Asserts that a function does not changes the value of a property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { console.log('foo'); };
     *     assert.doesNotChange(fn, obj, 'val');
     *
     * @name doesNotChange
     * @param {Function} modifier function
     * @param {Object} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.doesNotChange = function (fn, obj, prop) {
      new Assertion(fn).to.not.change(obj, prop);
    }
  
     /**
     * ### .increases(function, object, property)
     *
     * Asserts that a function increases an object property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { obj.val = 13 };
     *     assert.increases(fn, obj, 'val');
     *
     * @name increases
     * @param {Function} modifier function
     * @param {Object} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.increases = function (fn, obj, prop) {
      new Assertion(fn).to.increase(obj, prop);
    }
  
     /**
     * ### .doesNotIncrease(function, object, property)
     *
     * Asserts that a function does not increase object property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { obj.val = 8 };
     *     assert.doesNotIncrease(fn, obj, 'val');
     *
     * @name doesNotIncrease
     * @param {Function} modifier function
     * @param {Object} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.doesNotIncrease = function (fn, obj, prop) {
      new Assertion(fn).to.not.increase(obj, prop);
    }
  
     /**
     * ### .decreases(function, object, property)
     *
     * Asserts that a function decreases an object property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { obj.val = 5 };
     *     assert.decreases(fn, obj, 'val');
     *
     * @name decreases
     * @param {Function} modifier function
     * @param {Object} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.decreases = function (fn, obj, prop) {
      new Assertion(fn).to.decrease(obj, prop);
    }
  
     /**
     * ### .doesNotDecrease(function, object, property)
     *
     * Asserts that a function does not decreases an object property
     *
     *     var obj = { val: 10 };
     *     var fn = function() { obj.val = 15 };
     *     assert.doesNotDecrease(fn, obj, 'val');
     *
     * @name doesNotDecrease
     * @param {Function} modifier function
     * @param {Object} object
     * @param {String} property name
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.doesNotDecrease = function (fn, obj, prop) {
      new Assertion(fn).to.not.decrease(obj, prop);
    }
  
    /*!
     * ### .ifError(object)
     *
     * Asserts if value is not a false value, and throws if it is a true value.
     * This is added to allow for chai to be a drop-in replacement for Node's
     * assert class.
     *
     *     var err = new Error('I am a custom error');
     *     assert.ifError(err); // Rethrows err!
     *
     * @name ifError
     * @param {Object} object
     * @namespace Assert
     * @api public
     */
  
    assert.ifError = function (val) {
      if (val) {
        throw(val);
      }
    };
  
    /**
     * ### .isExtensible(object)
     *
     * Asserts that `object` is extensible (can have new properties added to it).
     *
     *     assert.isExtensible({});
     *
     * @name isExtensible
     * @alias extensible
     * @param {Object} object
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.isExtensible = function (obj, msg) {
      new Assertion(obj, msg).to.be.extensible;
    };
  
    /**
     * ### .isNotExtensible(object)
     *
     * Asserts that `object` is _not_ extensible.
     *
     *     var nonExtensibleObject = Object.preventExtensions({});
     *     var sealedObject = Object.seal({});
     *     var frozenObject = Object.freese({});
     *
     *     assert.isNotExtensible(nonExtensibleObject);
     *     assert.isNotExtensible(sealedObject);
     *     assert.isNotExtensible(frozenObject);
     *
     * @name isNotExtensible
     * @alias notExtensible
     * @param {Object} object
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.isNotExtensible = function (obj, msg) {
      new Assertion(obj, msg).to.not.be.extensible;
    };
  
    /**
     * ### .isSealed(object)
     *
     * Asserts that `object` is sealed (cannot have new properties added to it
     * and its existing properties cannot be removed).
     *
     *     var sealedObject = Object.seal({});
     *     var frozenObject = Object.seal({});
     *
     *     assert.isSealed(sealedObject);
     *     assert.isSealed(frozenObject);
     *
     * @name isSealed
     * @alias sealed
     * @param {Object} object
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.isSealed = function (obj, msg) {
      new Assertion(obj, msg).to.be.sealed;
    };
  
    /**
     * ### .isNotSealed(object)
     *
     * Asserts that `object` is _not_ sealed.
     *
     *     assert.isNotSealed({});
     *
     * @name isNotSealed
     * @alias notSealed
     * @param {Object} object
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.isNotSealed = function (obj, msg) {
      new Assertion(obj, msg).to.not.be.sealed;
    };
  
    /**
     * ### .isFrozen(object)
     *
     * Asserts that `object` is frozen (cannot have new properties added to it
     * and its existing properties cannot be modified).
     *
     *     var frozenObject = Object.freeze({});
     *     assert.frozen(frozenObject);
     *
     * @name isFrozen
     * @alias frozen
     * @param {Object} object
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.isFrozen = function (obj, msg) {
      new Assertion(obj, msg).to.be.frozen;
    };
  
    /**
     * ### .isNotFrozen(object)
     *
     * Asserts that `object` is _not_ frozen.
     *
     *     assert.isNotFrozen({});
     *
     * @name isNotFrozen
     * @alias notFrozen
     * @param {Object} object
     * @param {String} message _optional_
     * @namespace Assert
     * @api public
     */
  
    assert.isNotFrozen = function (obj, msg) {
      new Assertion(obj, msg).to.not.be.frozen;
    };
  
    /*!
     * Aliases.
     */
  
    (function alias(name, as){
      assert[as] = assert[name];
      return alias;
    })
    ('isOk', 'ok')
    ('isNotOk', 'notOk')
    ('throws', 'throw')
    ('throws', 'Throw')
    ('isExtensible', 'extensible')
    ('isNotExtensible', 'notExtensible')
    ('isSealed', 'sealed')
    ('isNotSealed', 'notSealed')
    ('isFrozen', 'frozen')
    ('isNotFrozen', 'notFrozen');
  };
  
  },{}],17:[function(require,module,exports){
  /*!
   * chai
   * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  module.exports = function (chai, util) {
    chai.expect = function (val, message) {
      return new chai.Assertion(val, message);
    };
  
    /**
     * ### .fail(actual, expected, [message], [operator])
     *
     * Throw a failure.
     *
     * @name fail
     * @param {Mixed} actual
     * @param {Mixed} expected
     * @param {String} message
     * @param {String} operator
     * @namespace Expect
     * @api public
     */
  
    chai.expect.fail = function (actual, expected, message, operator) {
      message = message || 'expect.fail()';
      throw new chai.AssertionError(message, {
          actual: actual
        , expected: expected
        , operator: operator
      }, chai.expect.fail);
    };
  };
  
  },{}],18:[function(require,module,exports){
  /*!
   * chai
   * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  module.exports = function (chai, util) {
    var Assertion = chai.Assertion;
  
    function loadShould () {
      // explicitly define this method as function as to have it's name to include as `ssfi`
      function shouldGetter() {
        if (this instanceof String || this instanceof Number || this instanceof Boolean ) {
          return new Assertion(this.valueOf(), null, shouldGetter);
        }
        return new Assertion(this, null, shouldGetter);
      }
      function shouldSetter(value) {
        // See https://github.com/chaijs/chai/issues/86: this makes
        // `whatever.should = someValue` actually set `someValue`, which is
        // especially useful for `global.should = require('chai').should()`.
        //
        // Note that we have to use [[DefineProperty]] instead of [[Put]]
        // since otherwise we would trigger this very setter!
        Object.defineProperty(this, 'should', {
          value: value,
          enumerable: true,
          configurable: true,
          writable: true
        });
      }
      // modify Object.prototype to have `should`
      Object.defineProperty(Object.prototype, 'should', {
        set: shouldSetter
        , get: shouldGetter
        , configurable: true
      });
  
      var should = {};
  
      /**
       * ### .fail(actual, expected, [message], [operator])
       *
       * Throw a failure.
       *
       * @name fail
       * @param {Mixed} actual
       * @param {Mixed} expected
       * @param {String} message
       * @param {String} operator
       * @namespace Should
       * @api public
       */
  
      should.fail = function (actual, expected, message, operator) {
        message = message || 'should.fail()';
        throw new chai.AssertionError(message, {
            actual: actual
          , expected: expected
          , operator: operator
        }, should.fail);
      };
  
      /**
       * ### .equal(actual, expected, [message])
       *
       * Asserts non-strict equality (`==`) of `actual` and `expected`.
       *
       *     should.equal(3, '3', '== coerces values to strings');
       *
       * @name equal
       * @param {Mixed} actual
       * @param {Mixed} expected
       * @param {String} message
       * @namespace Should
       * @api public
       */
  
      should.equal = function (val1, val2, msg) {
        new Assertion(val1, msg).to.equal(val2);
      };
  
      /**
       * ### .throw(function, [constructor/string/regexp], [string/regexp], [message])
       *
       * Asserts that `function` will throw an error that is an instance of
       * `constructor`, or alternately that it will throw an error with message
       * matching `regexp`.
       *
       *     should.throw(fn, 'function throws a reference error');
       *     should.throw(fn, /function throws a reference error/);
       *     should.throw(fn, ReferenceError);
       *     should.throw(fn, ReferenceError, 'function throws a reference error');
       *     should.throw(fn, ReferenceError, /function throws a reference error/);
       *
       * @name throw
       * @alias Throw
       * @param {Function} function
       * @param {ErrorConstructor} constructor
       * @param {RegExp} regexp
       * @param {String} message
       * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
       * @namespace Should
       * @api public
       */
  
      should.Throw = function (fn, errt, errs, msg) {
        new Assertion(fn, msg).to.Throw(errt, errs);
      };
  
      /**
       * ### .exist
       *
       * Asserts that the target is neither `null` nor `undefined`.
       *
       *     var foo = 'hi';
       *
       *     should.exist(foo, 'foo exists');
       *
       * @name exist
       * @namespace Should
       * @api public
       */
  
      should.exist = function (val, msg) {
        new Assertion(val, msg).to.exist;
      }
  
      // negation
      should.not = {}
  
      /**
       * ### .not.equal(actual, expected, [message])
       *
       * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
       *
       *     should.not.equal(3, 4, 'these numbers are not equal');
       *
       * @name not.equal
       * @param {Mixed} actual
       * @param {Mixed} expected
       * @param {String} message
       * @namespace Should
       * @api public
       */
  
      should.not.equal = function (val1, val2, msg) {
        new Assertion(val1, msg).to.not.equal(val2);
      };
  
      /**
       * ### .throw(function, [constructor/regexp], [message])
       *
       * Asserts that `function` will _not_ throw an error that is an instance of
       * `constructor`, or alternately that it will not throw an error with message
       * matching `regexp`.
       *
       *     should.not.throw(fn, Error, 'function does not throw');
       *
       * @name not.throw
       * @alias not.Throw
       * @param {Function} function
       * @param {ErrorConstructor} constructor
       * @param {RegExp} regexp
       * @param {String} message
       * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
       * @namespace Should
       * @api public
       */
  
      should.not.Throw = function (fn, errt, errs, msg) {
        new Assertion(fn, msg).to.not.Throw(errt, errs);
      };
  
      /**
       * ### .not.exist
       *
       * Asserts that the target is neither `null` nor `undefined`.
       *
       *     var bar = null;
       *
       *     should.not.exist(bar, 'bar does not exist');
       *
       * @name not.exist
       * @namespace Should
       * @api public
       */
  
      should.not.exist = function (val, msg) {
        new Assertion(val, msg).to.not.exist;
      }
  
      should['throw'] = should['Throw'];
      should.not['throw'] = should.not['Throw'];
  
      return should;
    };
  
    chai.should = loadShould;
    chai.Should = loadShould;
  };
  
  },{}],19:[function(require,module,exports){
  /*!
   * Chai - addChainingMethod utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /*!
   * Module dependencies
   */
  
  var transferFlags = require('./transferFlags');
  var flag = require('./flag');
  var config = require('../config');
  
  /*!
   * Module variables
   */
  
  // Check whether `__proto__` is supported
  var hasProtoSupport = '__proto__' in Object;
  
  // Without `__proto__` support, this module will need to add properties to a function.
  // However, some Function.prototype methods cannot be overwritten,
  // and there seems no easy cross-platform way to detect them (@see chaijs/chai/issues/69).
  var excludeNames = /^(?:length|name|arguments|caller)$/;
  
  // Cache `Function` properties
  var call  = Function.prototype.call,
      apply = Function.prototype.apply;
  
  /**
   * ### addChainableMethod (ctx, name, method, chainingBehavior)
   *
   * Adds a method to an object, such that the method can also be chained.
   *
   *     utils.addChainableMethod(chai.Assertion.prototype, 'foo', function (str) {
   *       var obj = utils.flag(this, 'object');
   *       new chai.Assertion(obj).to.be.equal(str);
   *     });
   *
   * Can also be accessed directly from `chai.Assertion`.
   *
   *     chai.Assertion.addChainableMethod('foo', fn, chainingBehavior);
   *
   * The result can then be used as both a method assertion, executing both `method` and
   * `chainingBehavior`, or as a language chain, which only executes `chainingBehavior`.
   *
   *     expect(fooStr).to.be.foo('bar');
   *     expect(fooStr).to.be.foo.equal('foo');
   *
   * @param {Object} ctx object to which the method is added
   * @param {String} name of method to add
   * @param {Function} method function to be used for `name`, when called
   * @param {Function} chainingBehavior function to be called every time the property is accessed
   * @namespace Utils
   * @name addChainableMethod
   * @api public
   */
  
  module.exports = function (ctx, name, method, chainingBehavior) {
    if (typeof chainingBehavior !== 'function') {
      chainingBehavior = function () { };
    }
  
    var chainableBehavior = {
        method: method
      , chainingBehavior: chainingBehavior
    };
  
    // save the methods so we can overwrite them later, if we need to.
    if (!ctx.__methods) {
      ctx.__methods = {};
    }
    ctx.__methods[name] = chainableBehavior;
  
    Object.defineProperty(ctx, name,
      { get: function () {
          chainableBehavior.chainingBehavior.call(this);
  
          var assert = function assert() {
            var old_ssfi = flag(this, 'ssfi');
            if (old_ssfi && config.includeStack === false)
              flag(this, 'ssfi', assert);
            var result = chainableBehavior.method.apply(this, arguments);
            return result === undefined ? this : result;
          };
  
          // Use `__proto__` if available
          if (hasProtoSupport) {
            // Inherit all properties from the object by replacing the `Function` prototype
            var prototype = assert.__proto__ = Object.create(this);
            // Restore the `call` and `apply` methods from `Function`
            prototype.call = call;
            prototype.apply = apply;
          }
          // Otherwise, redefine all properties (slow!)
          else {
            var asserterNames = Object.getOwnPropertyNames(ctx);
            asserterNames.forEach(function (asserterName) {
              if (!excludeNames.test(asserterName)) {
                var pd = Object.getOwnPropertyDescriptor(ctx, asserterName);
                Object.defineProperty(assert, asserterName, pd);
              }
            });
          }
  
          transferFlags(this, assert);
          return assert;
        }
      , configurable: true
    });
  };
  
  },{"../config":14,"./flag":23,"./transferFlags":39}],20:[function(require,module,exports){
  /*!
   * Chai - addMethod utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  var config = require('../config');
  
  /**
   * ### .addMethod (ctx, name, method)
   *
   * Adds a method to the prototype of an object.
   *
   *     utils.addMethod(chai.Assertion.prototype, 'foo', function (str) {
   *       var obj = utils.flag(this, 'object');
   *       new chai.Assertion(obj).to.be.equal(str);
   *     });
   *
   * Can also be accessed directly from `chai.Assertion`.
   *
   *     chai.Assertion.addMethod('foo', fn);
   *
   * Then can be used as any other assertion.
   *
   *     expect(fooStr).to.be.foo('bar');
   *
   * @param {Object} ctx object to which the method is added
   * @param {String} name of method to add
   * @param {Function} method function to be used for name
   * @namespace Utils
   * @name addMethod
   * @api public
   */
  var flag = require('./flag');
  
  module.exports = function (ctx, name, method) {
    ctx[name] = function () {
      var old_ssfi = flag(this, 'ssfi');
      if (old_ssfi && config.includeStack === false)
        flag(this, 'ssfi', ctx[name]);
      var result = method.apply(this, arguments);
      return result === undefined ? this : result;
    };
  };
  
  },{"../config":14,"./flag":23}],21:[function(require,module,exports){
  /*!
   * Chai - addProperty utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  var config = require('../config');
  var flag = require('./flag');
  
  /**
   * ### addProperty (ctx, name, getter)
   *
   * Adds a property to the prototype of an object.
   *
   *     utils.addProperty(chai.Assertion.prototype, 'foo', function () {
   *       var obj = utils.flag(this, 'object');
   *       new chai.Assertion(obj).to.be.instanceof(Foo);
   *     });
   *
   * Can also be accessed directly from `chai.Assertion`.
   *
   *     chai.Assertion.addProperty('foo', fn);
   *
   * Then can be used as any other assertion.
   *
   *     expect(myFoo).to.be.foo;
   *
   * @param {Object} ctx object to which the property is added
   * @param {String} name of property to add
   * @param {Function} getter function to be used for name
   * @namespace Utils
   * @name addProperty
   * @api public
   */
  
  module.exports = function (ctx, name, getter) {
    Object.defineProperty(ctx, name,
      { get: function addProperty() {
          var old_ssfi = flag(this, 'ssfi');
          if (old_ssfi && config.includeStack === false)
            flag(this, 'ssfi', addProperty);
  
          var result = getter.call(this);
          return result === undefined ? this : result;
        }
      , configurable: true
    });
  };
  
  },{"../config":14,"./flag":23}],22:[function(require,module,exports){
  /*!
   * Chai - expectTypes utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * ### expectTypes(obj, types)
   *
   * Ensures that the object being tested against is of a valid type.
   *
   *     utils.expectTypes(this, ['array', 'object', 'string']);
   *
   * @param {Mixed} obj constructed Assertion
   * @param {Array} type A list of allowed types for this assertion
   * @namespace Utils
   * @name expectTypes
   * @api public
   */
  
  var AssertionError = require('assertion-error');
  var flag = require('./flag');
  var type = require('type-detect');
  
  module.exports = function (obj, types) {
    var obj = flag(obj, 'object');
    types = types.map(function (t) { return t.toLowerCase(); });
    types.sort();
  
    // Transforms ['lorem', 'ipsum'] into 'a lirum, or an ipsum'
    var str = types.map(function (t, index) {
      var art = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(t.charAt(0)) ? 'an' : 'a';
      var or = types.length > 1 && index === types.length - 1 ? 'or ' : '';
      return or + art + ' ' + t;
    }).join(', ');
  
    if (!types.some(function (expected) { return type(obj) === expected; })) {
      throw new AssertionError(
        'object tested must be ' + str + ', but ' + type(obj) + ' given'
      );
    }
  };
  
  },{"./flag":23,"assertion-error":40,"type-detect":45}],23:[function(require,module,exports){
  /*!
   * Chai - flag utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * ### flag(object, key, [value])
   *
   * Get or set a flag value on an object. If a
   * value is provided it will be set, else it will
   * return the currently set value or `undefined` if
   * the value is not set.
   *
   *     utils.flag(this, 'foo', 'bar'); // setter
   *     utils.flag(this, 'foo'); // getter, returns `bar`
   *
   * @param {Object} object constructed Assertion
   * @param {String} key
   * @param {Mixed} value (optional)
   * @namespace Utils
   * @name flag
   * @api private
   */
  
  module.exports = function (obj, key, value) {
    var flags = obj.__flags || (obj.__flags = Object.create(null));
    if (arguments.length === 3) {
      flags[key] = value;
    } else {
      return flags[key];
    }
  };
  
  },{}],24:[function(require,module,exports){
  /*!
   * Chai - getActual utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * # getActual(object, [actual])
   *
   * Returns the `actual` value for an Assertion
   *
   * @param {Object} object (constructed Assertion)
   * @param {Arguments} chai.Assertion.prototype.assert arguments
   * @namespace Utils
   * @name getActual
   */
  
  module.exports = function (obj, args) {
    return args.length > 4 ? args[4] : obj._obj;
  };
  
  },{}],25:[function(require,module,exports){
  /*!
   * Chai - getEnumerableProperties utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * ### .getEnumerableProperties(object)
   *
   * This allows the retrieval of enumerable property names of an object,
   * inherited or not.
   *
   * @param {Object} object
   * @returns {Array}
   * @namespace Utils
   * @name getEnumerableProperties
   * @api public
   */
  
  module.exports = function getEnumerableProperties(object) {
    var result = [];
    for (var name in object) {
      result.push(name);
    }
    return result;
  };
  
  },{}],26:[function(require,module,exports){
  /*!
   * Chai - message composition utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /*!
   * Module dependancies
   */
  
  var flag = require('./flag')
    , getActual = require('./getActual')
    , inspect = require('./inspect')
    , objDisplay = require('./objDisplay');
  
  /**
   * ### .getMessage(object, message, negateMessage)
   *
   * Construct the error message based on flags
   * and template tags. Template tags will return
   * a stringified inspection of the object referenced.
   *
   * Message template tags:
   * - `#{this}` current asserted object
   * - `#{act}` actual value
   * - `#{exp}` expected value
   *
   * @param {Object} object (constructed Assertion)
   * @param {Arguments} chai.Assertion.prototype.assert arguments
   * @namespace Utils
   * @name getMessage
   * @api public
   */
  
  module.exports = function (obj, args) {
    var negate = flag(obj, 'negate')
      , val = flag(obj, 'object')
      , expected = args[3]
      , actual = getActual(obj, args)
      , msg = negate ? args[2] : args[1]
      , flagMsg = flag(obj, 'message');
  
    if(typeof msg === "function") msg = msg();
    msg = msg || '';
    msg = msg
      .replace(/#\{this\}/g, function () { return objDisplay(val); })
      .replace(/#\{act\}/g, function () { return objDisplay(actual); })
      .replace(/#\{exp\}/g, function () { return objDisplay(expected); });
  
    return flagMsg ? flagMsg + ': ' + msg : msg;
  };
  
  },{"./flag":23,"./getActual":24,"./inspect":33,"./objDisplay":34}],27:[function(require,module,exports){
  /*!
   * Chai - getName utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * # getName(func)
   *
   * Gets the name of a function, in a cross-browser way.
   *
   * @param {Function} a function (usually a constructor)
   * @namespace Utils
   * @name getName
   */
  
  module.exports = function (func) {
    if (func.name) return func.name;
  
    var match = /^\s?function ([^(]*)\(/.exec(func);
    return match && match[1] ? match[1] : "";
  };
  
  },{}],28:[function(require,module,exports){
  /*!
   * Chai - getPathInfo utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  var hasProperty = require('./hasProperty');
  
  /**
   * ### .getPathInfo(path, object)
   *
   * This allows the retrieval of property info in an
   * object given a string path.
   *
   * The path info consists of an object with the
   * following properties:
   *
   * * parent - The parent object of the property referenced by `path`
   * * name - The name of the final property, a number if it was an array indexer
   * * value - The value of the property, if it exists, otherwise `undefined`
   * * exists - Whether the property exists or not
   *
   * @param {String} path
   * @param {Object} object
   * @returns {Object} info
   * @namespace Utils
   * @name getPathInfo
   * @api public
   */
  
  module.exports = function getPathInfo(path, obj) {
    var parsed = parsePath(path),
        last = parsed[parsed.length - 1];
  
    var info = {
      parent: parsed.length > 1 ? _getPathValue(parsed, obj, parsed.length - 1) : obj,
      name: last.p || last.i,
      value: _getPathValue(parsed, obj)
    };
    info.exists = hasProperty(info.name, info.parent);
  
    return info;
  };
  
  
  /*!
   * ## parsePath(path)
   *
   * Helper function used to parse string object
   * paths. Use in conjunction with `_getPathValue`.
   *
   *      var parsed = parsePath('myobject.property.subprop');
   *
   * ### Paths:
   *
   * * Can be as near infinitely deep and nested
   * * Arrays are also valid using the formal `myobject.document[3].property`.
   * * Literal dots and brackets (not delimiter) must be backslash-escaped.
   *
   * @param {String} path
   * @returns {Object} parsed
   * @api private
   */
  
  function parsePath (path) {
    var str = path.replace(/([^\\])\[/g, '$1.[')
      , parts = str.match(/(\\\.|[^.]+?)+/g);
    return parts.map(function (value) {
      var re = /^\[(\d+)\]$/
        , mArr = re.exec(value);
      if (mArr) return { i: parseFloat(mArr[1]) };
      else return { p: value.replace(/\\([.\[\]])/g, '$1') };
    });
  }
  
  
  /*!
   * ## _getPathValue(parsed, obj)
   *
   * Helper companion function for `.parsePath` that returns
   * the value located at the parsed address.
   *
   *      var value = getPathValue(parsed, obj);
   *
   * @param {Object} parsed definition from `parsePath`.
   * @param {Object} object to search against
   * @param {Number} object to search against
   * @returns {Object|Undefined} value
   * @api private
   */
  
  function _getPathValue (parsed, obj, index) {
    var tmp = obj
      , res;
  
    index = (index === undefined ? parsed.length : index);
  
    for (var i = 0, l = index; i < l; i++) {
      var part = parsed[i];
      if (tmp) {
        if ('undefined' !== typeof part.p)
          tmp = tmp[part.p];
        else if ('undefined' !== typeof part.i)
          tmp = tmp[part.i];
        if (i == (l - 1)) res = tmp;
      } else {
        res = undefined;
      }
    }
    return res;
  }
  
  },{"./hasProperty":31}],29:[function(require,module,exports){
  /*!
   * Chai - getPathValue utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * @see https://github.com/logicalparadox/filtr
   * MIT Licensed
   */
  
  var getPathInfo = require('./getPathInfo');
  
  /**
   * ### .getPathValue(path, object)
   *
   * This allows the retrieval of values in an
   * object given a string path.
   *
   *     var obj = {
   *         prop1: {
   *             arr: ['a', 'b', 'c']
   *           , str: 'Hello'
   *         }
   *       , prop2: {
   *             arr: [ { nested: 'Universe' } ]
   *           , str: 'Hello again!'
   *         }
   *     }
   *
   * The following would be the results.
   *
   *     getPathValue('prop1.str', obj); // Hello
   *     getPathValue('prop1.att[2]', obj); // b
   *     getPathValue('prop2.arr[0].nested', obj); // Universe
   *
   * @param {String} path
   * @param {Object} object
   * @returns {Object} value or `undefined`
   * @namespace Utils
   * @name getPathValue
   * @api public
   */
  module.exports = function(path, obj) {
    var info = getPathInfo(path, obj);
    return info.value;
  };
  
  },{"./getPathInfo":28}],30:[function(require,module,exports){
  /*!
   * Chai - getProperties utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * ### .getProperties(object)
   *
   * This allows the retrieval of property names of an object, enumerable or not,
   * inherited or not.
   *
   * @param {Object} object
   * @returns {Array}
   * @namespace Utils
   * @name getProperties
   * @api public
   */
  
  module.exports = function getProperties(object) {
    var result = Object.getOwnPropertyNames(object);
  
    function addProperty(property) {
      if (result.indexOf(property) === -1) {
        result.push(property);
      }
    }
  
    var proto = Object.getPrototypeOf(object);
    while (proto !== null) {
      Object.getOwnPropertyNames(proto).forEach(addProperty);
      proto = Object.getPrototypeOf(proto);
    }
  
    return result;
  };
  
  },{}],31:[function(require,module,exports){
  /*!
   * Chai - hasProperty utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  var type = require('type-detect');
  
  /**
   * ### .hasProperty(object, name)
   *
   * This allows checking whether an object has
   * named property or numeric array index.
   *
   * Basically does the same thing as the `in`
   * operator but works properly with natives
   * and null/undefined values.
   *
   *     var obj = {
   *         arr: ['a', 'b', 'c']
   *       , str: 'Hello'
   *     }
   *
   * The following would be the results.
   *
   *     hasProperty('str', obj);  // true
   *     hasProperty('constructor', obj);  // true
   *     hasProperty('bar', obj);  // false
   *
   *     hasProperty('length', obj.str); // true
   *     hasProperty(1, obj.str);  // true
   *     hasProperty(5, obj.str);  // false
   *
   *     hasProperty('length', obj.arr);  // true
   *     hasProperty(2, obj.arr);  // true
   *     hasProperty(3, obj.arr);  // false
   *
   * @param {Objuect} object
   * @param {String|Number} name
   * @returns {Boolean} whether it exists
   * @namespace Utils
   * @name getPathInfo
   * @api public
   */
  
  var literals = {
      'number': Number
    , 'string': String
  };
  
  module.exports = function hasProperty(name, obj) {
    var ot = type(obj);
  
    // Bad Object, obviously no props at all
    if(ot === 'null' || ot === 'undefined')
      return false;
  
    // The `in` operator does not work with certain literals
    // box these before the check
    if(literals[ot] && typeof obj !== 'object')
      obj = new literals[ot](obj);
  
    return name in obj;
  };
  
  },{"type-detect":45}],32:[function(require,module,exports){
  /*!
   * chai
   * Copyright(c) 2011 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /*!
   * Main exports
   */
  
  var exports = module.exports = {};
  
  /*!
   * test utility
   */
  
  exports.test = require('./test');
  
  /*!
   * type utility
   */
  
  exports.type = require('type-detect');
  
  /*!
   * expectTypes utility
   */
  exports.expectTypes = require('./expectTypes');
  
  /*!
   * message utility
   */
  
  exports.getMessage = require('./getMessage');
  
  /*!
   * actual utility
   */
  
  exports.getActual = require('./getActual');
  
  /*!
   * Inspect util
   */
  
  exports.inspect = require('./inspect');
  
  /*!
   * Object Display util
   */
  
  exports.objDisplay = require('./objDisplay');
  
  /*!
   * Flag utility
   */
  
  exports.flag = require('./flag');
  
  /*!
   * Flag transferring utility
   */
  
  exports.transferFlags = require('./transferFlags');
  
  /*!
   * Deep equal utility
   */
  
  exports.eql = require('deep-eql');
  
  /*!
   * Deep path value
   */
  
  exports.getPathValue = require('./getPathValue');
  
  /*!
   * Deep path info
   */
  
  exports.getPathInfo = require('./getPathInfo');
  
  /*!
   * Check if a property exists
   */
  
  exports.hasProperty = require('./hasProperty');
  
  /*!
   * Function name
   */
  
  exports.getName = require('./getName');
  
  /*!
   * add Property
   */
  
  exports.addProperty = require('./addProperty');
  
  /*!
   * add Method
   */
  
  exports.addMethod = require('./addMethod');
  
  /*!
   * overwrite Property
   */
  
  exports.overwriteProperty = require('./overwriteProperty');
  
  /*!
   * overwrite Method
   */
  
  exports.overwriteMethod = require('./overwriteMethod');
  
  /*!
   * Add a chainable method
   */
  
  exports.addChainableMethod = require('./addChainableMethod');
  
  /*!
   * Overwrite chainable method
   */
  
  exports.overwriteChainableMethod = require('./overwriteChainableMethod');
  
  },{"./addChainableMethod":19,"./addMethod":20,"./addProperty":21,"./expectTypes":22,"./flag":23,"./getActual":24,"./getMessage":26,"./getName":27,"./getPathInfo":28,"./getPathValue":29,"./hasProperty":31,"./inspect":33,"./objDisplay":34,"./overwriteChainableMethod":35,"./overwriteMethod":36,"./overwriteProperty":37,"./test":38,"./transferFlags":39,"deep-eql":41,"type-detect":45}],33:[function(require,module,exports){
  // This is (almost) directly from Node.js utils
  // https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/util.js
  
  var getName = require('./getName');
  var getProperties = require('./getProperties');
  var getEnumerableProperties = require('./getEnumerableProperties');
  
  module.exports = inspect;
  
  /**
   * Echos the value of a value. Trys to print the value out
   * in the best way possible given the different types.
   *
   * @param {Object} obj The object to print out.
   * @param {Boolean} showHidden Flag that shows hidden (not enumerable)
   *    properties of objects.
   * @param {Number} depth Depth in which to descend in object. Default is 2.
   * @param {Boolean} colors Flag to turn on ANSI escape codes to color the
   *    output. Default is false (no coloring).
   * @namespace Utils
   * @name inspect
   */
  function inspect(obj, showHidden, depth, colors) {
    var ctx = {
      showHidden: showHidden,
      seen: [],
      stylize: function (str) { return str; }
    };
    return formatValue(ctx, obj, (typeof depth === 'undefined' ? 2 : depth));
  }
  
  // Returns true if object is a DOM element.
  var isDOMElement = function (object) {
    if (typeof HTMLElement === 'object') {
      return object instanceof HTMLElement;
    } else {
      return object &&
        typeof object === 'object' &&
        object.nodeType === 1 &&
        typeof object.nodeName === 'string';
    }
  };
  
  function formatValue(ctx, value, recurseTimes) {
    // Provide a hook for user-specified inspect functions.
    // Check that value is an object with an inspect function on it
    if (value && typeof value.inspect === 'function' &&
        // Filter out the util module, it's inspect function is special
        value.inspect !== exports.inspect &&
        // Also filter out any prototype objects using the circular check.
        !(value.constructor && value.constructor.prototype === value)) {
      var ret = value.inspect(recurseTimes);
      if (typeof ret !== 'string') {
        ret = formatValue(ctx, ret, recurseTimes);
      }
      return ret;
    }
  
    // Primitive types cannot have properties
    var primitive = formatPrimitive(ctx, value);
    if (primitive) {
      return primitive;
    }
  
    // If this is a DOM element, try to get the outer HTML.
    if (isDOMElement(value)) {
      if ('outerHTML' in value) {
        return value.outerHTML;
        // This value does not have an outerHTML attribute,
        //   it could still be an XML element
      } else {
        // Attempt to serialize it
        try {
          if (document.xmlVersion) {
            var xmlSerializer = new XMLSerializer();
            return xmlSerializer.serializeToString(value);
          } else {
            // Firefox 11- do not support outerHTML
            //   It does, however, support innerHTML
            //   Use the following to render the element
            var ns = "http://www.w3.org/1999/xhtml";
            var container = document.createElementNS(ns, '_');
  
            container.appendChild(value.cloneNode(false));
            html = container.innerHTML
              .replace('><', '>' + value.innerHTML + '<');
            container.innerHTML = '';
            return html;
          }
        } catch (err) {
          // This could be a non-native DOM implementation,
          //   continue with the normal flow:
          //   printing the element as if it is an object.
        }
      }
    }
  
    // Look up the keys of the object.
    var visibleKeys = getEnumerableProperties(value);
    var keys = ctx.showHidden ? getProperties(value) : visibleKeys;
  
    // Some type of object without properties can be shortcutted.
    // In IE, errors have a single `stack` property, or if they are vanilla `Error`,
    // a `stack` plus `description` property; ignore those for consistency.
    if (keys.length === 0 || (isError(value) && (
        (keys.length === 1 && keys[0] === 'stack') ||
        (keys.length === 2 && keys[0] === 'description' && keys[1] === 'stack')
       ))) {
      if (typeof value === 'function') {
        var name = getName(value);
        var nameSuffix = name ? ': ' + name : '';
        return ctx.stylize('[Function' + nameSuffix + ']', 'special');
      }
      if (isRegExp(value)) {
        return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
      }
      if (isDate(value)) {
        return ctx.stylize(Date.prototype.toUTCString.call(value), 'date');
      }
      if (isError(value)) {
        return formatError(value);
      }
    }
  
    var base = '', array = false, braces = ['{', '}'];
  
    // Make Array say that they are Array
    if (isArray(value)) {
      array = true;
      braces = ['[', ']'];
    }
  
    // Make functions say that they are functions
    if (typeof value === 'function') {
      var name = getName(value);
      var nameSuffix = name ? ': ' + name : '';
      base = ' [Function' + nameSuffix + ']';
    }
  
    // Make RegExps say that they are RegExps
    if (isRegExp(value)) {
      base = ' ' + RegExp.prototype.toString.call(value);
    }
  
    // Make dates with properties first say the date
    if (isDate(value)) {
      base = ' ' + Date.prototype.toUTCString.call(value);
    }
  
    // Make error with message first say the error
    if (isError(value)) {
      return formatError(value);
    }
  
    if (keys.length === 0 && (!array || value.length == 0)) {
      return braces[0] + base + braces[1];
    }
  
    if (recurseTimes < 0) {
      if (isRegExp(value)) {
        return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
      } else {
        return ctx.stylize('[Object]', 'special');
      }
    }
  
    ctx.seen.push(value);
  
    var output;
    if (array) {
      output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
    } else {
      output = keys.map(function(key) {
        return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
      });
    }
  
    ctx.seen.pop();
  
    return reduceToSingleString(output, base, braces);
  }
  
  
  function formatPrimitive(ctx, value) {
    switch (typeof value) {
      case 'undefined':
        return ctx.stylize('undefined', 'undefined');
  
      case 'string':
        var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                                 .replace(/'/g, "\\'")
                                                 .replace(/\\"/g, '"') + '\'';
        return ctx.stylize(simple, 'string');
  
      case 'number':
        if (value === 0 && (1/value) === -Infinity) {
          return ctx.stylize('-0', 'number');
        }
        return ctx.stylize('' + value, 'number');
  
      case 'boolean':
        return ctx.stylize('' + value, 'boolean');
    }
    // For some reason typeof null is "object", so special case here.
    if (value === null) {
      return ctx.stylize('null', 'null');
    }
  }
  
  
  function formatError(value) {
    return '[' + Error.prototype.toString.call(value) + ']';
  }
  
  
  function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
    var output = [];
    for (var i = 0, l = value.length; i < l; ++i) {
      if (Object.prototype.hasOwnProperty.call(value, String(i))) {
        output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
            String(i), true));
      } else {
        output.push('');
      }
    }
    keys.forEach(function(key) {
      if (!key.match(/^\d+$/)) {
        output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
            key, true));
      }
    });
    return output;
  }
  
  
  function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
    var name, str;
    if (value.__lookupGetter__) {
      if (value.__lookupGetter__(key)) {
        if (value.__lookupSetter__(key)) {
          str = ctx.stylize('[Getter/Setter]', 'special');
        } else {
          str = ctx.stylize('[Getter]', 'special');
        }
      } else {
        if (value.__lookupSetter__(key)) {
          str = ctx.stylize('[Setter]', 'special');
        }
      }
    }
    if (visibleKeys.indexOf(key) < 0) {
      name = '[' + key + ']';
    }
    if (!str) {
      if (ctx.seen.indexOf(value[key]) < 0) {
        if (recurseTimes === null) {
          str = formatValue(ctx, value[key], null);
        } else {
          str = formatValue(ctx, value[key], recurseTimes - 1);
        }
        if (str.indexOf('\n') > -1) {
          if (array) {
            str = str.split('\n').map(function(line) {
              return '  ' + line;
            }).join('\n').substr(2);
          } else {
            str = '\n' + str.split('\n').map(function(line) {
              return '   ' + line;
            }).join('\n');
          }
        }
      } else {
        str = ctx.stylize('[Circular]', 'special');
      }
    }
    if (typeof name === 'undefined') {
      if (array && key.match(/^\d+$/)) {
        return str;
      }
      name = JSON.stringify('' + key);
      if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
        name = name.substr(1, name.length - 2);
        name = ctx.stylize(name, 'name');
      } else {
        name = name.replace(/'/g, "\\'")
                   .replace(/\\"/g, '"')
                   .replace(/(^"|"$)/g, "'");
        name = ctx.stylize(name, 'string');
      }
    }
  
    return name + ': ' + str;
  }
  
  
  function reduceToSingleString(output, base, braces) {
    var numLinesEst = 0;
    var length = output.reduce(function(prev, cur) {
      numLinesEst++;
      if (cur.indexOf('\n') >= 0) numLinesEst++;
      return prev + cur.length + 1;
    }, 0);
  
    if (length > 60) {
      return braces[0] +
             (base === '' ? '' : base + '\n ') +
             ' ' +
             output.join(',\n  ') +
             ' ' +
             braces[1];
    }
  
    return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
  }
  
  function isArray(ar) {
    return Array.isArray(ar) ||
           (typeof ar === 'object' && objectToString(ar) === '[object Array]');
  }
  
  function isRegExp(re) {
    return typeof re === 'object' && objectToString(re) === '[object RegExp]';
  }
  
  function isDate(d) {
    return typeof d === 'object' && objectToString(d) === '[object Date]';
  }
  
  function isError(e) {
    return typeof e === 'object' && objectToString(e) === '[object Error]';
  }
  
  function objectToString(o) {
    return Object.prototype.toString.call(o);
  }
  
  },{"./getEnumerableProperties":25,"./getName":27,"./getProperties":30}],34:[function(require,module,exports){
  /*!
   * Chai - flag utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /*!
   * Module dependancies
   */
  
  var inspect = require('./inspect');
  var config = require('../config');
  
  /**
   * ### .objDisplay (object)
   *
   * Determines if an object or an array matches
   * criteria to be inspected in-line for error
   * messages or should be truncated.
   *
   * @param {Mixed} javascript object to inspect
   * @name objDisplay
   * @namespace Utils
   * @api public
   */
  
  module.exports = function (obj) {
    var str = inspect(obj)
      , type = Object.prototype.toString.call(obj);
  
    if (config.truncateThreshold && str.length >= config.truncateThreshold) {
      if (type === '[object Function]') {
        return !obj.name || obj.name === ''
          ? '[Function]'
          : '[Function: ' + obj.name + ']';
      } else if (type === '[object Array]') {
        return '[ Array(' + obj.length + ') ]';
      } else if (type === '[object Object]') {
        var keys = Object.keys(obj)
          , kstr = keys.length > 2
            ? keys.splice(0, 2).join(', ') + ', ...'
            : keys.join(', ');
        return '{ Object (' + kstr + ') }';
      } else {
        return str;
      }
    } else {
      return str;
    }
  };
  
  },{"../config":14,"./inspect":33}],35:[function(require,module,exports){
  /*!
   * Chai - overwriteChainableMethod utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * ### overwriteChainableMethod (ctx, name, method, chainingBehavior)
   *
   * Overwites an already existing chainable method
   * and provides access to the previous function or
   * property.  Must return functions to be used for
   * name.
   *
   *     utils.overwriteChainableMethod(chai.Assertion.prototype, 'length',
   *       function (_super) {
   *       }
   *     , function (_super) {
   *       }
   *     );
   *
   * Can also be accessed directly from `chai.Assertion`.
   *
   *     chai.Assertion.overwriteChainableMethod('foo', fn, fn);
   *
   * Then can be used as any other assertion.
   *
   *     expect(myFoo).to.have.length(3);
   *     expect(myFoo).to.have.length.above(3);
   *
   * @param {Object} ctx object whose method / property is to be overwritten
   * @param {String} name of method / property to overwrite
   * @param {Function} method function that returns a function to be used for name
   * @param {Function} chainingBehavior function that returns a function to be used for property
   * @namespace Utils
   * @name overwriteChainableMethod
   * @api public
   */
  
  module.exports = function (ctx, name, method, chainingBehavior) {
    var chainableBehavior = ctx.__methods[name];
  
    var _chainingBehavior = chainableBehavior.chainingBehavior;
    chainableBehavior.chainingBehavior = function () {
      var result = chainingBehavior(_chainingBehavior).call(this);
      return result === undefined ? this : result;
    };
  
    var _method = chainableBehavior.method;
    chainableBehavior.method = function () {
      var result = method(_method).apply(this, arguments);
      return result === undefined ? this : result;
    };
  };
  
  },{}],36:[function(require,module,exports){
  /*!
   * Chai - overwriteMethod utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * ### overwriteMethod (ctx, name, fn)
   *
   * Overwites an already existing method and provides
   * access to previous function. Must return function
   * to be used for name.
   *
   *     utils.overwriteMethod(chai.Assertion.prototype, 'equal', function (_super) {
   *       return function (str) {
   *         var obj = utils.flag(this, 'object');
   *         if (obj instanceof Foo) {
   *           new chai.Assertion(obj.value).to.equal(str);
   *         } else {
   *           _super.apply(this, arguments);
   *         }
   *       }
   *     });
   *
   * Can also be accessed directly from `chai.Assertion`.
   *
   *     chai.Assertion.overwriteMethod('foo', fn);
   *
   * Then can be used as any other assertion.
   *
   *     expect(myFoo).to.equal('bar');
   *
   * @param {Object} ctx object whose method is to be overwritten
   * @param {String} name of method to overwrite
   * @param {Function} method function that returns a function to be used for name
   * @namespace Utils
   * @name overwriteMethod
   * @api public
   */
  
  module.exports = function (ctx, name, method) {
    var _method = ctx[name]
      , _super = function () { return this; };
  
    if (_method && 'function' === typeof _method)
      _super = _method;
  
    ctx[name] = function () {
      var result = method(_super).apply(this, arguments);
      return result === undefined ? this : result;
    }
  };
  
  },{}],37:[function(require,module,exports){
  /*!
   * Chai - overwriteProperty utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * ### overwriteProperty (ctx, name, fn)
   *
   * Overwites an already existing property getter and provides
   * access to previous value. Must return function to use as getter.
   *
   *     utils.overwriteProperty(chai.Assertion.prototype, 'ok', function (_super) {
   *       return function () {
   *         var obj = utils.flag(this, 'object');
   *         if (obj instanceof Foo) {
   *           new chai.Assertion(obj.name).to.equal('bar');
   *         } else {
   *           _super.call(this);
   *         }
   *       }
   *     });
   *
   *
   * Can also be accessed directly from `chai.Assertion`.
   *
   *     chai.Assertion.overwriteProperty('foo', fn);
   *
   * Then can be used as any other assertion.
   *
   *     expect(myFoo).to.be.ok;
   *
   * @param {Object} ctx object whose property is to be overwritten
   * @param {String} name of property to overwrite
   * @param {Function} getter function that returns a getter function to be used for name
   * @namespace Utils
   * @name overwriteProperty
   * @api public
   */
  
  module.exports = function (ctx, name, getter) {
    var _get = Object.getOwnPropertyDescriptor(ctx, name)
      , _super = function () {};
  
    if (_get && 'function' === typeof _get.get)
      _super = _get.get
  
    Object.defineProperty(ctx, name,
      { get: function () {
          var result = getter(_super).call(this);
          return result === undefined ? this : result;
        }
      , configurable: true
    });
  };
  
  },{}],38:[function(require,module,exports){
  /*!
   * Chai - test utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /*!
   * Module dependancies
   */
  
  var flag = require('./flag');
  
  /**
   * # test(object, expression)
   *
   * Test and object for expression.
   *
   * @param {Object} object (constructed Assertion)
   * @param {Arguments} chai.Assertion.prototype.assert arguments
   * @namespace Utils
   * @name test
   */
  
  module.exports = function (obj, args) {
    var negate = flag(obj, 'negate')
      , expr = args[0];
    return negate ? !expr : expr;
  };
  
  },{"./flag":23}],39:[function(require,module,exports){
  /*!
   * Chai - transferFlags utility
   * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /**
   * ### transferFlags(assertion, object, includeAll = true)
   *
   * Transfer all the flags for `assertion` to `object`. If
   * `includeAll` is set to `false`, then the base Chai
   * assertion flags (namely `object`, `ssfi`, and `message`)
   * will not be transferred.
   *
   *
   *     var newAssertion = new Assertion();
   *     utils.transferFlags(assertion, newAssertion);
   *
   *     var anotherAsseriton = new Assertion(myObj);
   *     utils.transferFlags(assertion, anotherAssertion, false);
   *
   * @param {Assertion} assertion the assertion to transfer the flags from
   * @param {Object} object the object to transfer the flags to; usually a new assertion
   * @param {Boolean} includeAll
   * @namespace Utils
   * @name transferFlags
   * @api private
   */
  
  module.exports = function (assertion, object, includeAll) {
    var flags = assertion.__flags || (assertion.__flags = Object.create(null));
  
    if (!object.__flags) {
      object.__flags = Object.create(null);
    }
  
    includeAll = arguments.length === 3 ? includeAll : true;
  
    for (var flag in flags) {
      if (includeAll ||
          (flag !== 'object' && flag !== 'ssfi' && flag != 'message')) {
        object.__flags[flag] = flags[flag];
      }
    }
  };
  
  },{}],40:[function(require,module,exports){
  /*!
   * assertion-error
   * Copyright(c) 2013 Jake Luer <jake@qualiancy.com>
   * MIT Licensed
   */
  
  /*!
   * Return a function that will copy properties from
   * one object to another excluding any originally
   * listed. Returned function will create a new `{}`.
   *
   * @param {String} excluded properties ...
   * @return {Function}
   */
  
  function exclude () {
    var excludes = [].slice.call(arguments);
  
    function excludeProps (res, obj) {
      Object.keys(obj).forEach(function (key) {
        if (!~excludes.indexOf(key)) res[key] = obj[key];
      });
    }
  
    return function extendExclude () {
      var args = [].slice.call(arguments)
        , i = 0
        , res = {};
  
      for (; i < args.length; i++) {
        excludeProps(res, args[i]);
      }
  
      return res;
    };
  };
  
  /*!
   * Primary Exports
   */
  
  module.exports = AssertionError;
  
  /**
   * ### AssertionError
   *
   * An extension of the JavaScript `Error` constructor for
   * assertion and validation scenarios.
   *
   * @param {String} message
   * @param {Object} properties to include (optional)
   * @param {callee} start stack function (optional)
   */
  
  function AssertionError (message, _props, ssf) {
    var extend = exclude('name', 'message', 'stack', 'constructor', 'toJSON')
      , props = extend(_props || {});
  
    // default values
    this.message = message || 'Unspecified AssertionError';
    this.showDiff = false;
  
    // copy from properties
    for (var key in props) {
      this[key] = props[key];
    }
  
    // capture stack trace
    ssf = ssf || arguments.callee;
    if (ssf && Error.captureStackTrace) {
      Error.captureStackTrace(this, ssf);
    } else {
      try {
        throw new Error();
      } catch(e) {
        this.stack = e.stack;
      }
    }
  }
  
  /*!
   * Inherit from Error.prototype
   */
  
  AssertionError.prototype = Object.create(Error.prototype);
  
  /*!
   * Statically set name
   */
  
  AssertionError.prototype.name = 'AssertionError';
  
  /*!
   * Ensure correct constructor
   */
  
  AssertionError.prototype.constructor = AssertionError;
  
  /**
   * Allow errors to be converted to JSON for static transfer.
   *
   * @param {Boolean} include stack (default: `true`)
   * @return {Object} object that can be `JSON.stringify`
   */
  
  AssertionError.prototype.toJSON = function (stack) {
    var extend = exclude('constructor', 'toJSON', 'stack')
      , props = extend({ name: this.name }, this);
  
    // include stack if exists and not turned off
    if (false !== stack && this.stack) {
      props.stack = this.stack;
    }
  
    return props;
  };
  
  },{}],41:[function(require,module,exports){
  module.exports = require('./lib/eql');
  
  },{"./lib/eql":42}],42:[function(require,module,exports){
  /*!
   * deep-eql
   * Copyright(c) 2013 Jake Luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /*!
   * Module dependencies
   */
  
  var type = require('type-detect');
  
  /*!
   * Buffer.isBuffer browser shim
   */
  
  var Buffer;
  try { Buffer = require('buffer').Buffer; }
  catch(ex) {
    Buffer = {};
    Buffer.isBuffer = function() { return false; }
  }
  
  /*!
   * Primary Export
   */
  
  module.exports = deepEqual;
  
  /**
   * Assert super-strict (egal) equality between
   * two objects of any type.
   *
   * @param {Mixed} a
   * @param {Mixed} b
   * @param {Array} memoised (optional)
   * @return {Boolean} equal match
   */
  
  function deepEqual(a, b, m) {
    if (sameValue(a, b)) {
      return true;
    } else if ('date' === type(a)) {
      return dateEqual(a, b);
    } else if ('regexp' === type(a)) {
      return regexpEqual(a, b);
    } else if (Buffer.isBuffer(a)) {
      return bufferEqual(a, b);
    } else if ('arguments' === type(a)) {
      return argumentsEqual(a, b, m);
    } else if (!typeEqual(a, b)) {
      return false;
    } else if (('object' !== type(a) && 'object' !== type(b))
    && ('array' !== type(a) && 'array' !== type(b))) {
      return sameValue(a, b);
    } else {
      return objectEqual(a, b, m);
    }
  }
  
  /*!
   * Strict (egal) equality test. Ensures that NaN always
   * equals NaN and `-0` does not equal `+0`.
   *
   * @param {Mixed} a
   * @param {Mixed} b
   * @return {Boolean} equal match
   */
  
  function sameValue(a, b) {
    if (a === b) return a !== 0 || 1 / a === 1 / b;
    return a !== a && b !== b;
  }
  
  /*!
   * Compare the types of two given objects and
   * return if they are equal. Note that an Array
   * has a type of `array` (not `object`) and arguments
   * have a type of `arguments` (not `array`/`object`).
   *
   * @param {Mixed} a
   * @param {Mixed} b
   * @return {Boolean} result
   */
  
  function typeEqual(a, b) {
    return type(a) === type(b);
  }
  
  /*!
   * Compare two Date objects by asserting that
   * the time values are equal using `saveValue`.
   *
   * @param {Date} a
   * @param {Date} b
   * @return {Boolean} result
   */
  
  function dateEqual(a, b) {
    if ('date' !== type(b)) return false;
    return sameValue(a.getTime(), b.getTime());
  }
  
  /*!
   * Compare two regular expressions by converting them
   * to string and checking for `sameValue`.
   *
   * @param {RegExp} a
   * @param {RegExp} b
   * @return {Boolean} result
   */
  
  function regexpEqual(a, b) {
    if ('regexp' !== type(b)) return false;
    return sameValue(a.toString(), b.toString());
  }
  
  /*!
   * Assert deep equality of two `arguments` objects.
   * Unfortunately, these must be sliced to arrays
   * prior to test to ensure no bad behavior.
   *
   * @param {Arguments} a
   * @param {Arguments} b
   * @param {Array} memoize (optional)
   * @return {Boolean} result
   */
  
  function argumentsEqual(a, b, m) {
    if ('arguments' !== type(b)) return false;
    a = [].slice.call(a);
    b = [].slice.call(b);
    return deepEqual(a, b, m);
  }
  
  /*!
   * Get enumerable properties of a given object.
   *
   * @param {Object} a
   * @return {Array} property names
   */
  
  function enumerable(a) {
    var res = [];
    for (var key in a) res.push(key);
    return res;
  }
  
  /*!
   * Simple equality for flat iterable objects
   * such as Arrays or Node.js buffers.
   *
   * @param {Iterable} a
   * @param {Iterable} b
   * @return {Boolean} result
   */
  
  function iterableEqual(a, b) {
    if (a.length !==  b.length) return false;
  
    var i = 0;
    var match = true;
  
    for (; i < a.length; i++) {
      if (a[i] !== b[i]) {
        match = false;
        break;
      }
    }
  
    return match;
  }
  
  /*!
   * Extension to `iterableEqual` specifically
   * for Node.js Buffers.
   *
   * @param {Buffer} a
   * @param {Mixed} b
   * @return {Boolean} result
   */
  
  function bufferEqual(a, b) {
    if (!Buffer.isBuffer(b)) return false;
    return iterableEqual(a, b);
  }
  
  /*!
   * Block for `objectEqual` ensuring non-existing
   * values don't get in.
   *
   * @param {Mixed} object
   * @return {Boolean} result
   */
  
  function isValue(a) {
    return a !== null && a !== undefined;
  }
  
  /*!
   * Recursively check the equality of two objects.
   * Once basic sameness has been established it will
   * defer to `deepEqual` for each enumerable key
   * in the object.
   *
   * @param {Mixed} a
   * @param {Mixed} b
   * @return {Boolean} result
   */
  
  function objectEqual(a, b, m) {
    if (!isValue(a) || !isValue(b)) {
      return false;
    }
  
    if (a.prototype !== b.prototype) {
      return false;
    }
  
    var i;
    if (m) {
      for (i = 0; i < m.length; i++) {
        if ((m[i][0] === a && m[i][1] === b)
        ||  (m[i][0] === b && m[i][1] === a)) {
          return true;
        }
      }
    } else {
      m = [];
    }
  
    try {
      var ka = enumerable(a);
      var kb = enumerable(b);
    } catch (ex) {
      return false;
    }
  
    ka.sort();
    kb.sort();
  
    if (!iterableEqual(ka, kb)) {
      return false;
    }
  
    m.push([ a, b ]);
  
    var key;
    for (i = ka.length - 1; i >= 0; i--) {
      key = ka[i];
      if (!deepEqual(a[key], b[key], m)) {
        return false;
      }
    }
  
    return true;
  }
  
  },{"buffer":50,"type-detect":43}],43:[function(require,module,exports){
  module.exports = require('./lib/type');
  
  },{"./lib/type":44}],44:[function(require,module,exports){
  /*!
   * type-detect
   * Copyright(c) 2013 jake luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /*!
   * Primary Exports
   */
  
  var exports = module.exports = getType;
  
  /*!
   * Detectable javascript natives
   */
  
  var natives = {
      '[object Array]': 'array'
    , '[object RegExp]': 'regexp'
    , '[object Function]': 'function'
    , '[object Arguments]': 'arguments'
    , '[object Date]': 'date'
  };
  
  /**
   * ### typeOf (obj)
   *
   * Use several different techniques to determine
   * the type of object being tested.
   *
   *
   * @param {Mixed} object
   * @return {String} object type
   * @api public
   */
  
  function getType (obj) {
    var str = Object.prototype.toString.call(obj);
    if (natives[str]) return natives[str];
    if (obj === null) return 'null';
    if (obj === undefined) return 'undefined';
    if (obj === Object(obj)) return 'object';
    return typeof obj;
  }
  
  exports.Library = Library;
  
  /**
   * ### Library
   *
   * Create a repository for custom type detection.
   *
   * ```js
   * var lib = new type.Library;
   * ```
   *
   */
  
  function Library () {
    this.tests = {};
  }
  
  /**
   * #### .of (obj)
   *
   * Expose replacement `typeof` detection to the library.
   *
   * ```js
   * if ('string' === lib.of('hello world')) {
   *   // ...
   * }
   * ```
   *
   * @param {Mixed} object to test
   * @return {String} type
   */
  
  Library.prototype.of = getType;
  
  /**
   * #### .define (type, test)
   *
   * Add a test to for the `.test()` assertion.
   *
   * Can be defined as a regular expression:
   *
   * ```js
   * lib.define('int', /^[0-9]+$/);
   * ```
   *
   * ... or as a function:
   *
   * ```js
   * lib.define('bln', function (obj) {
   *   if ('boolean' === lib.of(obj)) return true;
   *   var blns = [ 'yes', 'no', 'true', 'false', 1, 0 ];
   *   if ('string' === lib.of(obj)) obj = obj.toLowerCase();
   *   return !! ~blns.indexOf(obj);
   * });
   * ```
   *
   * @param {String} type
   * @param {RegExp|Function} test
   * @api public
   */
  
  Library.prototype.define = function (type, test) {
    if (arguments.length === 1) return this.tests[type];
    this.tests[type] = test;
    return this;
  };
  
  /**
   * #### .test (obj, test)
   *
   * Assert that an object is of type. Will first
   * check natives, and if that does not pass it will
   * use the user defined custom tests.
   *
   * ```js
   * assert(lib.test('1', 'int'));
   * assert(lib.test('yes', 'bln'));
   * ```
   *
   * @param {Mixed} object
   * @param {String} type
   * @return {Boolean} result
   * @api public
   */
  
  Library.prototype.test = function (obj, type) {
    if (type === getType(obj)) return true;
    var test = this.tests[type];
  
    if (test && 'regexp' === getType(test)) {
      return test.test(obj);
    } else if (test && 'function' === getType(test)) {
      return test(obj);
    } else {
      throw new ReferenceError('Type test "' + type + '" not defined or invalid.');
    }
  };
  
  },{}],45:[function(require,module,exports){
  arguments[4][43][0].apply(exports,arguments)
  },{"./lib/type":46,"dup":43}],46:[function(require,module,exports){
  /*!
   * type-detect
   * Copyright(c) 2013 jake luer <jake@alogicalparadox.com>
   * MIT Licensed
   */
  
  /*!
   * Primary Exports
   */
  
  var exports = module.exports = getType;
  
  /**
   * ### typeOf (obj)
   *
   * Use several different techniques to determine
   * the type of object being tested.
   *
   *
   * @param {Mixed} object
   * @return {String} object type
   * @api public
   */
  var objectTypeRegexp = /^\[object (.*)\]$/;
  
  function getType(obj) {
    var type = Object.prototype.toString.call(obj).match(objectTypeRegexp)[1].toLowerCase();
    // Let "new String('')" return 'object'
    if (typeof Promise === 'function' && obj instanceof Promise) return 'promise';
    // PhantomJS has type "DOMWindow" for null
    if (obj === null) return 'null';
    // PhantomJS has type "DOMWindow" for undefined
    if (obj === undefined) return 'undefined';
    return type;
  }
  
  exports.Library = Library;
  
  /**
   * ### Library
   *
   * Create a repository for custom type detection.
   *
   * ```js
   * var lib = new type.Library;
   * ```
   *
   */
  
  function Library() {
    if (!(this instanceof Library)) return new Library();
    this.tests = {};
  }
  
  /**
   * #### .of (obj)
   *
   * Expose replacement `typeof` detection to the library.
   *
   * ```js
   * if ('string' === lib.of('hello world')) {
   *   // ...
   * }
   * ```
   *
   * @param {Mixed} object to test
   * @return {String} type
   */
  
  Library.prototype.of = getType;
  
  /**
   * #### .define (type, test)
   *
   * Add a test to for the `.test()` assertion.
   *
   * Can be defined as a regular expression:
   *
   * ```js
   * lib.define('int', /^[0-9]+$/);
   * ```
   *
   * ... or as a function:
   *
   * ```js
   * lib.define('bln', function (obj) {
   *   if ('boolean' === lib.of(obj)) return true;
   *   var blns = [ 'yes', 'no', 'true', 'false', 1, 0 ];
   *   if ('string' === lib.of(obj)) obj = obj.toLowerCase();
   *   return !! ~blns.indexOf(obj);
   * });
   * ```
   *
   * @param {String} type
   * @param {RegExp|Function} test
   * @api public
   */
  
  Library.prototype.define = function(type, test) {
    if (arguments.length === 1) return this.tests[type];
    this.tests[type] = test;
    return this;
  };
  
  /**
   * #### .test (obj, test)
   *
   * Assert that an object is of type. Will first
   * check natives, and if that does not pass it will
   * use the user defined custom tests.
   *
   * ```js
   * assert(lib.test('1', 'int'));
   * assert(lib.test('yes', 'bln'));
   * ```
   *
   * @param {Mixed} object
   * @param {String} type
   * @return {Boolean} result
   * @api public
   */
  
  Library.prototype.test = function(obj, type) {
    if (type === getType(obj)) return true;
    var test = this.tests[type];
  
    if (test && 'regexp' === getType(test)) {
      return test.test(obj);
    } else if (test && 'function' === getType(test)) {
      return test(obj);
    } else {
      throw new ReferenceError('Type test "' + type + '" not defined or invalid.');
    }
  };
  
  },{}],47:[function(require,module,exports){
  /* jshint node: true */
  (function () {
      "use strict";
  
      function CookieAccessInfo(domain, path, secure, script) {
          if (this instanceof CookieAccessInfo) {
              this.domain = domain || undefined;
              this.path = path || "/";
              this.secure = !!secure;
              this.script = !!script;
              return this;
          }
          return new CookieAccessInfo(domain, path, secure, script);
      }
      CookieAccessInfo.All = Object.freeze(Object.create(null));
      exports.CookieAccessInfo = CookieAccessInfo;
  
      function Cookie(cookiestr, request_domain, request_path) {
          if (cookiestr instanceof Cookie) {
              return cookiestr;
          }
          if (this instanceof Cookie) {
              this.name = null;
              this.value = null;
              this.expiration_date = Infinity;
              this.path = String(request_path || "/");
              this.explicit_path = false;
              this.domain = request_domain || null;
              this.explicit_domain = false;
              this.secure = false; //how to define default?
              this.noscript = false; //httponly
              if (cookiestr) {
                  this.parse(cookiestr, request_domain, request_path);
              }
              return this;
          }
          return new Cookie(cookiestr, request_domain, request_path);
      }
      exports.Cookie = Cookie;
  
      Cookie.prototype.toString = function toString() {
          var str = [this.name + "=" + this.value];
          if (this.expiration_date !== Infinity) {
              str.push("expires=" + (new Date(this.expiration_date)).toGMTString());
          }
          if (this.domain) {
              str.push("domain=" + this.domain);
          }
          if (this.path) {
              str.push("path=" + this.path);
          }
          if (this.secure) {
              str.push("secure");
          }
          if (this.noscript) {
              str.push("httponly");
          }
          return str.join("; ");
      };
  
      Cookie.prototype.toValueString = function toValueString() {
          return this.name + "=" + this.value;
      };
  
      var cookie_str_splitter = /[:](?=\s*[a-zA-Z0-9_\-]+\s*[=])/g;
      Cookie.prototype.parse = function parse(str, request_domain, request_path) {
          if (this instanceof Cookie) {
              var parts = str.split(";").filter(function (value) {
                      return !!value;
                  }),
                  pair = parts[0].match(/([^=]+)=([\s\S]*)/),
                  key = pair[1],
                  value = pair[2],
                  i;
              this.name = key;
              this.value = value;
  
              for (i = 1; i < parts.length; i += 1) {
                  pair = parts[i].match(/([^=]+)(?:=([\s\S]*))?/);
                  key = pair[1].trim().toLowerCase();
                  value = pair[2];
                  switch (key) {
                  case "httponly":
                      this.noscript = true;
                      break;
                  case "expires":
                      this.expiration_date = value ?
                              Number(Date.parse(value)) :
                              Infinity;
                      break;
                  case "path":
                      this.path = value ?
                              value.trim() :
                              "";
                      this.explicit_path = true;
                      break;
                  case "domain":
                      this.domain = value ?
                              value.trim() :
                              "";
                      this.explicit_domain = !!this.domain;
                      break;
                  case "secure":
                      this.secure = true;
                      break;
                  }
              }
  
              if (!this.explicit_path) {
                 this.path = request_path || "/";
              }
              if (!this.explicit_domain) {
                 this.domain = request_domain;
              }
  
              return this;
          }
          return new Cookie().parse(str, request_domain, request_path);
      };
  
      Cookie.prototype.matches = function matches(access_info) {
          if (access_info === CookieAccessInfo.All) {
            return true;
          }
          if (this.noscript && access_info.script ||
                  this.secure && !access_info.secure ||
                  !this.collidesWith(access_info)) {
              return false;
          }
          return true;
      };
  
      Cookie.prototype.collidesWith = function collidesWith(access_info) {
          if ((this.path && !access_info.path) || (this.domain && !access_info.domain)) {
              return false;
          }
          if (this.path && access_info.path.indexOf(this.path) !== 0) {
              return false;
          }
          if (this.explicit_path && access_info.path.indexOf( this.path ) !== 0) {
             return false;
          }
          var access_domain = access_info.domain && access_info.domain.replace(/^[\.]/,'');
          var cookie_domain = this.domain && this.domain.replace(/^[\.]/,'');
          if (cookie_domain === access_domain) {
              return true;
          }
          if (cookie_domain) {
              if (!this.explicit_domain) {
                  return false; // we already checked if the domains were exactly the same
              }
              var wildcard = access_domain.indexOf(cookie_domain);
              if (wildcard === -1 || wildcard !== access_domain.length - cookie_domain.length) {
                  return false;
              }
              return true;
          }
          return true;
      };
  
      function CookieJar() {
          var cookies, cookies_list, collidable_cookie;
          if (this instanceof CookieJar) {
              cookies = Object.create(null); //name: [Cookie]
  
              this.setCookie = function setCookie(cookie, request_domain, request_path) {
                  var remove, i;
                  cookie = new Cookie(cookie, request_domain, request_path);
                  //Delete the cookie if the set is past the current time
                  remove = cookie.expiration_date <= Date.now();
                  if (cookies[cookie.name] !== undefined) {
                      cookies_list = cookies[cookie.name];
                      for (i = 0; i < cookies_list.length; i += 1) {
                          collidable_cookie = cookies_list[i];
                          if (collidable_cookie.collidesWith(cookie)) {
                              if (remove) {
                                  cookies_list.splice(i, 1);
                                  if (cookies_list.length === 0) {
                                      delete cookies[cookie.name];
                                  }
                                  return false;
                              }
                              cookies_list[i] = cookie;
                              return cookie;
                          }
                      }
                      if (remove) {
                          return false;
                      }
                      cookies_list.push(cookie);
                      return cookie;
                  }
                  if (remove) {
                      return false;
                  }
                  cookies[cookie.name] = [cookie];
                  return cookies[cookie.name];
              };
              //returns a cookie
              this.getCookie = function getCookie(cookie_name, access_info) {
                  var cookie, i;
                  cookies_list = cookies[cookie_name];
                  if (!cookies_list) {
                      return;
                  }
                  for (i = 0; i < cookies_list.length; i += 1) {
                      cookie = cookies_list[i];
                      if (cookie.expiration_date <= Date.now()) {
                          if (cookies_list.length === 0) {
                              delete cookies[cookie.name];
                          }
                          continue;
                      }
  
                      if (cookie.matches(access_info)) {
                          return cookie;
                      }
                  }
              };
              //returns a list of cookies
              this.getCookies = function getCookies(access_info) {
                  var matches = [], cookie_name, cookie;
                  for (cookie_name in cookies) {
                      cookie = this.getCookie(cookie_name, access_info);
                      if (cookie) {
                          matches.push(cookie);
                      }
                  }
                  matches.toString = function toString() {
                      return matches.join(":");
                  };
                  matches.toValueString = function toValueString() {
                      return matches.map(function (c) {
                          return c.toValueString();
                      }).join(';');
                  };
                  return matches;
              };
  
              return this;
          }
          return new CookieJar();
      }
      exports.CookieJar = CookieJar;
  
      //returns list of cookies that were set correctly. Cookies that are expired and removed are not returned.
      CookieJar.prototype.setCookies = function setCookies(cookies, request_domain, request_path) {
          cookies = Array.isArray(cookies) ?
                  cookies :
                  cookies.split(cookie_str_splitter);
          var successful = [],
              i,
              cookie;
          cookies = cookies.map(function(item){
              return new Cookie(item, request_domain, request_path);
          });
          for (i = 0; i < cookies.length; i += 1) {
              cookie = cookies[i];
              if (this.setCookie(cookie, request_domain, request_path)) {
                  successful.push(cookie);
              }
          }
          return successful;
      };
  }());
  
  },{}],48:[function(require,module,exports){
  'use strict';
  var ipRegex = require('ip-regex');
  
  var ip = module.exports = function (str) {
  	return ipRegex({exact: true}).test(str);
  };
  
  ip.v4 = function (str) {
  	return ipRegex.v4({exact: true}).test(str);
  };
  
  ip.v6 = function (str) {
  	return ipRegex.v6({exact: true}).test(str);
  };
  
  },{"ip-regex":49}],49:[function(require,module,exports){
  'use strict';
  
  var v4 = '(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])(?:\\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])){3}';
  var v6 = '(?:(?:[0-9a-fA-F:]){1,4}(?:(?::(?:[0-9a-fA-F]){1,4}|:)){2,7})+';
  
  var ip = module.exports = function (opts) {
  	opts = opts || {};
  	return opts.exact ? new RegExp('(?:^' + v4 + '$)|(?:^' + v6 + '$)') :
  	                    new RegExp('(?:' + v4 + ')|(?:' + v6 + ')', 'g');
  };
  
  ip.v4 = function (opts) {
  	opts = opts || {};
  	return opts.exact ? new RegExp('^' + v4 + '$') : new RegExp(v4, 'g');
  };
  
  ip.v6 = function (opts) {
  	opts = opts || {};
  	return opts.exact ? new RegExp('^' + v6 + '$') : new RegExp(v6, 'g');
  };
  
  },{}],50:[function(require,module,exports){
  (function (global){
  /*!
   * The buffer module from node.js, for the browser.
   *
   * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
   * @license  MIT
   */
  /* eslint-disable no-proto */
  
  'use strict'
  
  var base64 = require('base64-js')
  var ieee754 = require('ieee754')
  var isArray = require('isarray')
  
  exports.Buffer = Buffer
  exports.SlowBuffer = SlowBuffer
  exports.INSPECT_MAX_BYTES = 50
  
  /**
   * If `Buffer.TYPED_ARRAY_SUPPORT`:
   *   === true    Use Uint8Array implementation (fastest)
   *   === false   Use Object implementation (most compatible, even IE6)
   *
   * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
   * Opera 11.6+, iOS 4.2+.
   *
   * Due to various browser bugs, sometimes the Object implementation will be used even
   * when the browser supports typed arrays.
   *
   * Note:
   *
   *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
   *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
   *
   *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
   *
   *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
   *     incorrect length in some situations.
  
   * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
   * get the Object implementation, which is slower but behaves correctly.
   */
  Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
    ? global.TYPED_ARRAY_SUPPORT
    : typedArraySupport()
  
  /*
   * Export kMaxLength after typed array support is determined.
   */
  exports.kMaxLength = kMaxLength()
  
  function typedArraySupport () {
    try {
      var arr = new Uint8Array(1)
      arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}
      return arr.foo() === 42 && // typed array instances can be augmented
          typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
          arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
    } catch (e) {
      return false
    }
  }
  
  function kMaxLength () {
    return Buffer.TYPED_ARRAY_SUPPORT
      ? 0x7fffffff
      : 0x3fffffff
  }
  
  function createBuffer (that, length) {
    if (kMaxLength() < length) {
      throw new RangeError('Invalid typed array length')
    }
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      // Return an augmented `Uint8Array` instance, for best performance
      that = new Uint8Array(length)
      that.__proto__ = Buffer.prototype
    } else {
      // Fallback: Return an object instance of the Buffer class
      if (that === null) {
        that = new Buffer(length)
      }
      that.length = length
    }
  
    return that
  }
  
  /**
   * The Buffer constructor returns instances of `Uint8Array` that have their
   * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
   * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
   * and the `Uint8Array` methods. Square bracket notation works as expected -- it
   * returns a single octet.
   *
   * The `Uint8Array` prototype remains unmodified.
   */
  
  function Buffer (arg, encodingOrOffset, length) {
    if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
      return new Buffer(arg, encodingOrOffset, length)
    }
  
    // Common case.
    if (typeof arg === 'number') {
      if (typeof encodingOrOffset === 'string') {
        throw new Error(
          'If encoding is specified then the first argument must be a string'
        )
      }
      return allocUnsafe(this, arg)
    }
    return from(this, arg, encodingOrOffset, length)
  }
  
  Buffer.poolSize = 8192 // not used by this implementation
  
  // TODO: Legacy, not needed anymore. Remove in next major version.
  Buffer._augment = function (arr) {
    arr.__proto__ = Buffer.prototype
    return arr
  }
  
  function from (that, value, encodingOrOffset, length) {
    if (typeof value === 'number') {
      throw new TypeError('"value" argument must not be a number')
    }
  
    if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
      return fromArrayBuffer(that, value, encodingOrOffset, length)
    }
  
    if (typeof value === 'string') {
      return fromString(that, value, encodingOrOffset)
    }
  
    return fromObject(that, value)
  }
  
  /**
   * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
   * if value is a number.
   * Buffer.from(str[, encoding])
   * Buffer.from(array)
   * Buffer.from(buffer)
   * Buffer.from(arrayBuffer[, byteOffset[, length]])
   **/
  Buffer.from = function (value, encodingOrOffset, length) {
    return from(null, value, encodingOrOffset, length)
  }
  
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    Buffer.prototype.__proto__ = Uint8Array.prototype
    Buffer.__proto__ = Uint8Array
    if (typeof Symbol !== 'undefined' && Symbol.species &&
        Buffer[Symbol.species] === Buffer) {
      // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
      Object.defineProperty(Buffer, Symbol.species, {
        value: null,
        configurable: true
      })
    }
  }
  
  function assertSize (size) {
    if (typeof size !== 'number') {
      throw new TypeError('"size" argument must be a number')
    } else if (size < 0) {
      throw new RangeError('"size" argument must not be negative')
    }
  }
  
  function alloc (that, size, fill, encoding) {
    assertSize(size)
    if (size <= 0) {
      return createBuffer(that, size)
    }
    if (fill !== undefined) {
      // Only pay attention to encoding if it's a string. This
      // prevents accidentally sending in a number that would
      // be interpretted as a start offset.
      return typeof encoding === 'string'
        ? createBuffer(that, size).fill(fill, encoding)
        : createBuffer(that, size).fill(fill)
    }
    return createBuffer(that, size)
  }
  
  /**
   * Creates a new filled Buffer instance.
   * alloc(size[, fill[, encoding]])
   **/
  Buffer.alloc = function (size, fill, encoding) {
    return alloc(null, size, fill, encoding)
  }
  
  function allocUnsafe (that, size) {
    assertSize(size)
    that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)
    if (!Buffer.TYPED_ARRAY_SUPPORT) {
      for (var i = 0; i < size; ++i) {
        that[i] = 0
      }
    }
    return that
  }
  
  /**
   * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
   * */
  Buffer.allocUnsafe = function (size) {
    return allocUnsafe(null, size)
  }
  /**
   * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
   */
  Buffer.allocUnsafeSlow = function (size) {
    return allocUnsafe(null, size)
  }
  
  function fromString (that, string, encoding) {
    if (typeof encoding !== 'string' || encoding === '') {
      encoding = 'utf8'
    }
  
    if (!Buffer.isEncoding(encoding)) {
      throw new TypeError('"encoding" must be a valid string encoding')
    }
  
    var length = byteLength(string, encoding) | 0
    that = createBuffer(that, length)
  
    var actual = that.write(string, encoding)
  
    if (actual !== length) {
      // Writing a hex string, for example, that contains invalid characters will
      // cause everything after the first invalid character to be ignored. (e.g.
      // 'abxxcd' will be treated as 'ab')
      that = that.slice(0, actual)
    }
  
    return that
  }
  
  function fromArrayLike (that, array) {
    var length = array.length < 0 ? 0 : checked(array.length) | 0
    that = createBuffer(that, length)
    for (var i = 0; i < length; i += 1) {
      that[i] = array[i] & 255
    }
    return that
  }
  
  function fromArrayBuffer (that, array, byteOffset, length) {
    array.byteLength // this throws if `array` is not a valid ArrayBuffer
  
    if (byteOffset < 0 || array.byteLength < byteOffset) {
      throw new RangeError('\'offset\' is out of bounds')
    }
  
    if (array.byteLength < byteOffset + (length || 0)) {
      throw new RangeError('\'length\' is out of bounds')
    }
  
    if (byteOffset === undefined && length === undefined) {
      array = new Uint8Array(array)
    } else if (length === undefined) {
      array = new Uint8Array(array, byteOffset)
    } else {
      array = new Uint8Array(array, byteOffset, length)
    }
  
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      // Return an augmented `Uint8Array` instance, for best performance
      that = array
      that.__proto__ = Buffer.prototype
    } else {
      // Fallback: Return an object instance of the Buffer class
      that = fromArrayLike(that, array)
    }
    return that
  }
  
  function fromObject (that, obj) {
    if (Buffer.isBuffer(obj)) {
      var len = checked(obj.length) | 0
      that = createBuffer(that, len)
  
      if (that.length === 0) {
        return that
      }
  
      obj.copy(that, 0, 0, len)
      return that
    }
  
    if (obj) {
      if ((typeof ArrayBuffer !== 'undefined' &&
          obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
        if (typeof obj.length !== 'number' || isnan(obj.length)) {
          return createBuffer(that, 0)
        }
        return fromArrayLike(that, obj)
      }
  
      if (obj.type === 'Buffer' && isArray(obj.data)) {
        return fromArrayLike(that, obj.data)
      }
    }
  
    throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
  }
  
  function checked (length) {
    // Note: cannot use `length < kMaxLength()` here because that fails when
    // length is NaN (which is otherwise coerced to zero.)
    if (length >= kMaxLength()) {
      throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                           'size: 0x' + kMaxLength().toString(16) + ' bytes')
    }
    return length | 0
  }
  
  function SlowBuffer (length) {
    if (+length != length) { // eslint-disable-line eqeqeq
      length = 0
    }
    return Buffer.alloc(+length)
  }
  
  Buffer.isBuffer = function isBuffer (b) {
    return !!(b != null && b._isBuffer)
  }
  
  Buffer.compare = function compare (a, b) {
    if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
      throw new TypeError('Arguments must be Buffers')
    }
  
    if (a === b) return 0
  
    var x = a.length
    var y = b.length
  
    for (var i = 0, len = Math.min(x, y); i < len; ++i) {
      if (a[i] !== b[i]) {
        x = a[i]
        y = b[i]
        break
      }
    }
  
    if (x < y) return -1
    if (y < x) return 1
    return 0
  }
  
  Buffer.isEncoding = function isEncoding (encoding) {
    switch (String(encoding).toLowerCase()) {
      case 'hex':
      case 'utf8':
      case 'utf-8':
      case 'ascii':
      case 'latin1':
      case 'binary':
      case 'base64':
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return true
      default:
        return false
    }
  }
  
  Buffer.concat = function concat (list, length) {
    if (!isArray(list)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
  
    if (list.length === 0) {
      return Buffer.alloc(0)
    }
  
    var i
    if (length === undefined) {
      length = 0
      for (i = 0; i < list.length; ++i) {
        length += list[i].length
      }
    }
  
    var buffer = Buffer.allocUnsafe(length)
    var pos = 0
    for (i = 0; i < list.length; ++i) {
      var buf = list[i]
      if (!Buffer.isBuffer(buf)) {
        throw new TypeError('"list" argument must be an Array of Buffers')
      }
      buf.copy(buffer, pos)
      pos += buf.length
    }
    return buffer
  }
  
  function byteLength (string, encoding) {
    if (Buffer.isBuffer(string)) {
      return string.length
    }
    if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
        (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
      return string.byteLength
    }
    if (typeof string !== 'string') {
      string = '' + string
    }
  
    var len = string.length
    if (len === 0) return 0
  
    // Use a for loop to avoid recursion
    var loweredCase = false
    for (;;) {
      switch (encoding) {
        case 'ascii':
        case 'latin1':
        case 'binary':
          return len
        case 'utf8':
        case 'utf-8':
        case undefined:
          return utf8ToBytes(string).length
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return len * 2
        case 'hex':
          return len >>> 1
        case 'base64':
          return base64ToBytes(string).length
        default:
          if (loweredCase) return utf8ToBytes(string).length // assume utf8
          encoding = ('' + encoding).toLowerCase()
          loweredCase = true
      }
    }
  }
  Buffer.byteLength = byteLength
  
  function slowToString (encoding, start, end) {
    var loweredCase = false
  
    // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
    // property of a typed array.
  
    // This behaves neither like String nor Uint8Array in that we set start/end
    // to their upper/lower bounds if the value passed is out of range.
    // undefined is handled specially as per ECMA-262 6th Edition,
    // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
    if (start === undefined || start < 0) {
      start = 0
    }
    // Return early if start > this.length. Done here to prevent potential uint32
    // coercion fail below.
    if (start > this.length) {
      return ''
    }
  
    if (end === undefined || end > this.length) {
      end = this.length
    }
  
    if (end <= 0) {
      return ''
    }
  
    // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
    end >>>= 0
    start >>>= 0
  
    if (end <= start) {
      return ''
    }
  
    if (!encoding) encoding = 'utf8'
  
    while (true) {
      switch (encoding) {
        case 'hex':
          return hexSlice(this, start, end)
  
        case 'utf8':
        case 'utf-8':
          return utf8Slice(this, start, end)
  
        case 'ascii':
          return asciiSlice(this, start, end)
  
        case 'latin1':
        case 'binary':
          return latin1Slice(this, start, end)
  
        case 'base64':
          return base64Slice(this, start, end)
  
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return utf16leSlice(this, start, end)
  
        default:
          if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
          encoding = (encoding + '').toLowerCase()
          loweredCase = true
      }
    }
  }
  
  // The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
  // Buffer instances.
  Buffer.prototype._isBuffer = true
  
  function swap (b, n, m) {
    var i = b[n]
    b[n] = b[m]
    b[m] = i
  }
  
  Buffer.prototype.swap16 = function swap16 () {
    var len = this.length
    if (len % 2 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 16-bits')
    }
    for (var i = 0; i < len; i += 2) {
      swap(this, i, i + 1)
    }
    return this
  }
  
  Buffer.prototype.swap32 = function swap32 () {
    var len = this.length
    if (len % 4 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 32-bits')
    }
    for (var i = 0; i < len; i += 4) {
      swap(this, i, i + 3)
      swap(this, i + 1, i + 2)
    }
    return this
  }
  
  Buffer.prototype.swap64 = function swap64 () {
    var len = this.length
    if (len % 8 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 64-bits')
    }
    for (var i = 0; i < len; i += 8) {
      swap(this, i, i + 7)
      swap(this, i + 1, i + 6)
      swap(this, i + 2, i + 5)
      swap(this, i + 3, i + 4)
    }
    return this
  }
  
  Buffer.prototype.toString = function toString () {
    var length = this.length | 0
    if (length === 0) return ''
    if (arguments.length === 0) return utf8Slice(this, 0, length)
    return slowToString.apply(this, arguments)
  }
  
  Buffer.prototype.equals = function equals (b) {
    if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
    if (this === b) return true
    return Buffer.compare(this, b) === 0
  }
  
  Buffer.prototype.inspect = function inspect () {
    var str = ''
    var max = exports.INSPECT_MAX_BYTES
    if (this.length > 0) {
      str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
      if (this.length > max) str += ' ... '
    }
    return '<Buffer ' + str + '>'
  }
  
  Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
    if (!Buffer.isBuffer(target)) {
      throw new TypeError('Argument must be a Buffer')
    }
  
    if (start === undefined) {
      start = 0
    }
    if (end === undefined) {
      end = target ? target.length : 0
    }
    if (thisStart === undefined) {
      thisStart = 0
    }
    if (thisEnd === undefined) {
      thisEnd = this.length
    }
  
    if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
      throw new RangeError('out of range index')
    }
  
    if (thisStart >= thisEnd && start >= end) {
      return 0
    }
    if (thisStart >= thisEnd) {
      return -1
    }
    if (start >= end) {
      return 1
    }
  
    start >>>= 0
    end >>>= 0
    thisStart >>>= 0
    thisEnd >>>= 0
  
    if (this === target) return 0
  
    var x = thisEnd - thisStart
    var y = end - start
    var len = Math.min(x, y)
  
    var thisCopy = this.slice(thisStart, thisEnd)
    var targetCopy = target.slice(start, end)
  
    for (var i = 0; i < len; ++i) {
      if (thisCopy[i] !== targetCopy[i]) {
        x = thisCopy[i]
        y = targetCopy[i]
        break
      }
    }
  
    if (x < y) return -1
    if (y < x) return 1
    return 0
  }
  
  // Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
  // OR the last index of `val` in `buffer` at offset <= `byteOffset`.
  //
  // Arguments:
  // - buffer - a Buffer to search
  // - val - a string, Buffer, or number
  // - byteOffset - an index into `buffer`; will be clamped to an int32
  // - encoding - an optional encoding, relevant is val is a string
  // - dir - true for indexOf, false for lastIndexOf
  function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
    // Empty buffer means no match
    if (buffer.length === 0) return -1
  
    // Normalize byteOffset
    if (typeof byteOffset === 'string') {
      encoding = byteOffset
      byteOffset = 0
    } else if (byteOffset > 0x7fffffff) {
      byteOffset = 0x7fffffff
    } else if (byteOffset < -0x80000000) {
      byteOffset = -0x80000000
    }
    byteOffset = +byteOffset  // Coerce to Number.
    if (isNaN(byteOffset)) {
      // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
      byteOffset = dir ? 0 : (buffer.length - 1)
    }
  
    // Normalize byteOffset: negative offsets start from the end of the buffer
    if (byteOffset < 0) byteOffset = buffer.length + byteOffset
    if (byteOffset >= buffer.length) {
      if (dir) return -1
      else byteOffset = buffer.length - 1
    } else if (byteOffset < 0) {
      if (dir) byteOffset = 0
      else return -1
    }
  
    // Normalize val
    if (typeof val === 'string') {
      val = Buffer.from(val, encoding)
    }
  
    // Finally, search either indexOf (if dir is true) or lastIndexOf
    if (Buffer.isBuffer(val)) {
      // Special case: looking for empty string/buffer always fails
      if (val.length === 0) {
        return -1
      }
      return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
    } else if (typeof val === 'number') {
      val = val & 0xFF // Search for a byte value [0-255]
      if (Buffer.TYPED_ARRAY_SUPPORT &&
          typeof Uint8Array.prototype.indexOf === 'function') {
        if (dir) {
          return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
        } else {
          return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
        }
      }
      return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
    }
  
    throw new TypeError('val must be string, number or Buffer')
  }
  
  function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
    var indexSize = 1
    var arrLength = arr.length
    var valLength = val.length
  
    if (encoding !== undefined) {
      encoding = String(encoding).toLowerCase()
      if (encoding === 'ucs2' || encoding === 'ucs-2' ||
          encoding === 'utf16le' || encoding === 'utf-16le') {
        if (arr.length < 2 || val.length < 2) {
          return -1
        }
        indexSize = 2
        arrLength /= 2
        valLength /= 2
        byteOffset /= 2
      }
    }
  
    function read (buf, i) {
      if (indexSize === 1) {
        return buf[i]
      } else {
        return buf.readUInt16BE(i * indexSize)
      }
    }
  
    var i
    if (dir) {
      var foundIndex = -1
      for (i = byteOffset; i < arrLength; i++) {
        if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
          if (foundIndex === -1) foundIndex = i
          if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
        } else {
          if (foundIndex !== -1) i -= i - foundIndex
          foundIndex = -1
        }
      }
    } else {
      if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
      for (i = byteOffset; i >= 0; i--) {
        var found = true
        for (var j = 0; j < valLength; j++) {
          if (read(arr, i + j) !== read(val, j)) {
            found = false
            break
          }
        }
        if (found) return i
      }
    }
  
    return -1
  }
  
  Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
    return this.indexOf(val, byteOffset, encoding) !== -1
  }
  
  Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
  }
  
  Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
  }
  
  function hexWrite (buf, string, offset, length) {
    offset = Number(offset) || 0
    var remaining = buf.length - offset
    if (!length) {
      length = remaining
    } else {
      length = Number(length)
      if (length > remaining) {
        length = remaining
      }
    }
  
    // must be an even number of digits
    var strLen = string.length
    if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')
  
    if (length > strLen / 2) {
      length = strLen / 2
    }
    for (var i = 0; i < length; ++i) {
      var parsed = parseInt(string.substr(i * 2, 2), 16)
      if (isNaN(parsed)) return i
      buf[offset + i] = parsed
    }
    return i
  }
  
  function utf8Write (buf, string, offset, length) {
    return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
  }
  
  function asciiWrite (buf, string, offset, length) {
    return blitBuffer(asciiToBytes(string), buf, offset, length)
  }
  
  function latin1Write (buf, string, offset, length) {
    return asciiWrite(buf, string, offset, length)
  }
  
  function base64Write (buf, string, offset, length) {
    return blitBuffer(base64ToBytes(string), buf, offset, length)
  }
  
  function ucs2Write (buf, string, offset, length) {
    return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
  }
  
  Buffer.prototype.write = function write (string, offset, length, encoding) {
    // Buffer#write(string)
    if (offset === undefined) {
      encoding = 'utf8'
      length = this.length
      offset = 0
    // Buffer#write(string, encoding)
    } else if (length === undefined && typeof offset === 'string') {
      encoding = offset
      length = this.length
      offset = 0
    // Buffer#write(string, offset[, length][, encoding])
    } else if (isFinite(offset)) {
      offset = offset | 0
      if (isFinite(length)) {
        length = length | 0
        if (encoding === undefined) encoding = 'utf8'
      } else {
        encoding = length
        length = undefined
      }
    // legacy write(string, encoding, offset, length) - remove in v0.13
    } else {
      throw new Error(
        'Buffer.write(string, encoding, offset[, length]) is no longer supported'
      )
    }
  
    var remaining = this.length - offset
    if (length === undefined || length > remaining) length = remaining
  
    if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
      throw new RangeError('Attempt to write outside buffer bounds')
    }
  
    if (!encoding) encoding = 'utf8'
  
    var loweredCase = false
    for (;;) {
      switch (encoding) {
        case 'hex':
          return hexWrite(this, string, offset, length)
  
        case 'utf8':
        case 'utf-8':
          return utf8Write(this, string, offset, length)
  
        case 'ascii':
          return asciiWrite(this, string, offset, length)
  
        case 'latin1':
        case 'binary':
          return latin1Write(this, string, offset, length)
  
        case 'base64':
          // Warning: maxLength not taken into account in base64Write
          return base64Write(this, string, offset, length)
  
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return ucs2Write(this, string, offset, length)
  
        default:
          if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
          encoding = ('' + encoding).toLowerCase()
          loweredCase = true
      }
    }
  }
  
  Buffer.prototype.toJSON = function toJSON () {
    return {
      type: 'Buffer',
      data: Array.prototype.slice.call(this._arr || this, 0)
    }
  }
  
  function base64Slice (buf, start, end) {
    if (start === 0 && end === buf.length) {
      return base64.fromByteArray(buf)
    } else {
      return base64.fromByteArray(buf.slice(start, end))
    }
  }
  
  function utf8Slice (buf, start, end) {
    end = Math.min(buf.length, end)
    var res = []
  
    var i = start
    while (i < end) {
      var firstByte = buf[i]
      var codePoint = null
      var bytesPerSequence = (firstByte > 0xEF) ? 4
        : (firstByte > 0xDF) ? 3
        : (firstByte > 0xBF) ? 2
        : 1
  
      if (i + bytesPerSequence <= end) {
        var secondByte, thirdByte, fourthByte, tempCodePoint
  
        switch (bytesPerSequence) {
          case 1:
            if (firstByte < 0x80) {
              codePoint = firstByte
            }
            break
          case 2:
            secondByte = buf[i + 1]
            if ((secondByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
              if (tempCodePoint > 0x7F) {
                codePoint = tempCodePoint
              }
            }
            break
          case 3:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
              if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                codePoint = tempCodePoint
              }
            }
            break
          case 4:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            fourthByte = buf[i + 3]
            if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
              if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                codePoint = tempCodePoint
              }
            }
        }
      }
  
      if (codePoint === null) {
        // we did not generate a valid codePoint so insert a
        // replacement char (U+FFFD) and advance only 1 byte
        codePoint = 0xFFFD
        bytesPerSequence = 1
      } else if (codePoint > 0xFFFF) {
        // encode to utf16 (surrogate pair dance)
        codePoint -= 0x10000
        res.push(codePoint >>> 10 & 0x3FF | 0xD800)
        codePoint = 0xDC00 | codePoint & 0x3FF
      }
  
      res.push(codePoint)
      i += bytesPerSequence
    }
  
    return decodeCodePointsArray(res)
  }
  
  // Based on http://stackoverflow.com/a/22747272/680742, the browser with
  // the lowest limit is Chrome, with 0x10000 args.
  // We go 1 magnitude less, for safety
  var MAX_ARGUMENTS_LENGTH = 0x1000
  
  function decodeCodePointsArray (codePoints) {
    var len = codePoints.length
    if (len <= MAX_ARGUMENTS_LENGTH) {
      return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
    }
  
    // Decode in chunks to avoid "call stack size exceeded".
    var res = ''
    var i = 0
    while (i < len) {
      res += String.fromCharCode.apply(
        String,
        codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
      )
    }
    return res
  }
  
  function asciiSlice (buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)
  
    for (var i = start; i < end; ++i) {
      ret += String.fromCharCode(buf[i] & 0x7F)
    }
    return ret
  }
  
  function latin1Slice (buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)
  
    for (var i = start; i < end; ++i) {
      ret += String.fromCharCode(buf[i])
    }
    return ret
  }
  
  function hexSlice (buf, start, end) {
    var len = buf.length
  
    if (!start || start < 0) start = 0
    if (!end || end < 0 || end > len) end = len
  
    var out = ''
    for (var i = start; i < end; ++i) {
      out += toHex(buf[i])
    }
    return out
  }
  
  function utf16leSlice (buf, start, end) {
    var bytes = buf.slice(start, end)
    var res = ''
    for (var i = 0; i < bytes.length; i += 2) {
      res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
    }
    return res
  }
  
  Buffer.prototype.slice = function slice (start, end) {
    var len = this.length
    start = ~~start
    end = end === undefined ? len : ~~end
  
    if (start < 0) {
      start += len
      if (start < 0) start = 0
    } else if (start > len) {
      start = len
    }
  
    if (end < 0) {
      end += len
      if (end < 0) end = 0
    } else if (end > len) {
      end = len
    }
  
    if (end < start) end = start
  
    var newBuf
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      newBuf = this.subarray(start, end)
      newBuf.__proto__ = Buffer.prototype
    } else {
      var sliceLen = end - start
      newBuf = new Buffer(sliceLen, undefined)
      for (var i = 0; i < sliceLen; ++i) {
        newBuf[i] = this[i + start]
      }
    }
  
    return newBuf
  }
  
  /*
   * Need to make sure that buffer isn't trying to write out of bounds.
   */
  function checkOffset (offset, ext, length) {
    if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
    if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
  }
  
  Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
      val += this[offset + i] * mul
    }
  
    return val
  }
  
  Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      checkOffset(offset, byteLength, this.length)
    }
  
    var val = this[offset + --byteLength]
    var mul = 1
    while (byteLength > 0 && (mul *= 0x100)) {
      val += this[offset + --byteLength] * mul
    }
  
    return val
  }
  
  Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 1, this.length)
    return this[offset]
  }
  
  Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    return this[offset] | (this[offset + 1] << 8)
  }
  
  Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    return (this[offset] << 8) | this[offset + 1]
  }
  
  Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return ((this[offset]) |
        (this[offset + 1] << 8) |
        (this[offset + 2] << 16)) +
        (this[offset + 3] * 0x1000000)
  }
  
  Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset] * 0x1000000) +
      ((this[offset + 1] << 16) |
      (this[offset + 2] << 8) |
      this[offset + 3])
  }
  
  Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
      val += this[offset + i] * mul
    }
    mul *= 0x80
  
    if (val >= mul) val -= Math.pow(2, 8 * byteLength)
  
    return val
  }
  
  Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var i = byteLength
    var mul = 1
    var val = this[offset + --i]
    while (i > 0 && (mul *= 0x100)) {
      val += this[offset + --i] * mul
    }
    mul *= 0x80
  
    if (val >= mul) val -= Math.pow(2, 8 * byteLength)
  
    return val
  }
  
  Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 1, this.length)
    if (!(this[offset] & 0x80)) return (this[offset])
    return ((0xff - this[offset] + 1) * -1)
  }
  
  Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset] | (this[offset + 1] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
  }
  
  Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset + 1] | (this[offset] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
  }
  
  Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16) |
      (this[offset + 3] << 24)
  }
  
  Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset] << 24) |
      (this[offset + 1] << 16) |
      (this[offset + 2] << 8) |
      (this[offset + 3])
  }
  
  Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, true, 23, 4)
  }
  
  Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, false, 23, 4)
  }
  
  Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, true, 52, 8)
  }
  
  Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, false, 52, 8)
  }
  
  function checkInt (buf, value, offset, ext, max, min) {
    if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
    if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
  }
  
  Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      var maxBytes = Math.pow(2, 8 * byteLength) - 1
      checkInt(this, value, offset, byteLength, maxBytes, 0)
    }
  
    var mul = 1
    var i = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
      this[offset + i] = (value / mul) & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      var maxBytes = Math.pow(2, 8 * byteLength) - 1
      checkInt(this, value, offset, byteLength, maxBytes, 0)
    }
  
    var i = byteLength - 1
    var mul = 1
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
      this[offset + i] = (value / mul) & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
    if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
    this[offset] = (value & 0xff)
    return offset + 1
  }
  
  function objectWriteUInt16 (buf, value, offset, littleEndian) {
    if (value < 0) value = 0xffff + value + 1
    for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {
      buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
        (littleEndian ? i : 1 - i) * 8
    }
  }
  
  Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
    } else {
      objectWriteUInt16(this, value, offset, true)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 8)
      this[offset + 1] = (value & 0xff)
    } else {
      objectWriteUInt16(this, value, offset, false)
    }
    return offset + 2
  }
  
  function objectWriteUInt32 (buf, value, offset, littleEndian) {
    if (value < 0) value = 0xffffffff + value + 1
    for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {
      buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
    }
  }
  
  Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset + 3] = (value >>> 24)
      this[offset + 2] = (value >>> 16)
      this[offset + 1] = (value >>> 8)
      this[offset] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, true)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 24)
      this[offset + 1] = (value >>> 16)
      this[offset + 2] = (value >>> 8)
      this[offset + 3] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, false)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) {
      var limit = Math.pow(2, 8 * byteLength - 1)
  
      checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }
  
    var i = 0
    var mul = 1
    var sub = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
      if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
        sub = 1
      }
      this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) {
      var limit = Math.pow(2, 8 * byteLength - 1)
  
      checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }
  
    var i = byteLength - 1
    var mul = 1
    var sub = 0
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
      if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
        sub = 1
      }
      this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
    if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
    if (value < 0) value = 0xff + value + 1
    this[offset] = (value & 0xff)
    return offset + 1
  }
  
  Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
    } else {
      objectWriteUInt16(this, value, offset, true)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 8)
      this[offset + 1] = (value & 0xff)
    } else {
      objectWriteUInt16(this, value, offset, false)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
      this[offset + 2] = (value >>> 16)
      this[offset + 3] = (value >>> 24)
    } else {
      objectWriteUInt32(this, value, offset, true)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (value < 0) value = 0xffffffff + value + 1
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 24)
      this[offset + 1] = (value >>> 16)
      this[offset + 2] = (value >>> 8)
      this[offset + 3] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, false)
    }
    return offset + 4
  }
  
  function checkIEEE754 (buf, value, offset, ext, max, min) {
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
    if (offset < 0) throw new RangeError('Index out of range')
  }
  
  function writeFloat (buf, value, offset, littleEndian, noAssert) {
    if (!noAssert) {
      checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
    }
    ieee754.write(buf, value, offset, littleEndian, 23, 4)
    return offset + 4
  }
  
  Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
    return writeFloat(this, value, offset, true, noAssert)
  }
  
  Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
    return writeFloat(this, value, offset, false, noAssert)
  }
  
  function writeDouble (buf, value, offset, littleEndian, noAssert) {
    if (!noAssert) {
      checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
    }
    ieee754.write(buf, value, offset, littleEndian, 52, 8)
    return offset + 8
  }
  
  Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
    return writeDouble(this, value, offset, true, noAssert)
  }
  
  Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
    return writeDouble(this, value, offset, false, noAssert)
  }
  
  // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
  Buffer.prototype.copy = function copy (target, targetStart, start, end) {
    if (!start) start = 0
    if (!end && end !== 0) end = this.length
    if (targetStart >= target.length) targetStart = target.length
    if (!targetStart) targetStart = 0
    if (end > 0 && end < start) end = start
  
    // Copy 0 bytes; we're done
    if (end === start) return 0
    if (target.length === 0 || this.length === 0) return 0
  
    // Fatal error conditions
    if (targetStart < 0) {
      throw new RangeError('targetStart out of bounds')
    }
    if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
    if (end < 0) throw new RangeError('sourceEnd out of bounds')
  
    // Are we oob?
    if (end > this.length) end = this.length
    if (target.length - targetStart < end - start) {
      end = target.length - targetStart + start
    }
  
    var len = end - start
    var i
  
    if (this === target && start < targetStart && targetStart < end) {
      // descending copy from end
      for (i = len - 1; i >= 0; --i) {
        target[i + targetStart] = this[i + start]
      }
    } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
      // ascending copy from start
      for (i = 0; i < len; ++i) {
        target[i + targetStart] = this[i + start]
      }
    } else {
      Uint8Array.prototype.set.call(
        target,
        this.subarray(start, start + len),
        targetStart
      )
    }
  
    return len
  }
  
  // Usage:
  //    buffer.fill(number[, offset[, end]])
  //    buffer.fill(buffer[, offset[, end]])
  //    buffer.fill(string[, offset[, end]][, encoding])
  Buffer.prototype.fill = function fill (val, start, end, encoding) {
    // Handle string cases:
    if (typeof val === 'string') {
      if (typeof start === 'string') {
        encoding = start
        start = 0
        end = this.length
      } else if (typeof end === 'string') {
        encoding = end
        end = this.length
      }
      if (val.length === 1) {
        var code = val.charCodeAt(0)
        if (code < 256) {
          val = code
        }
      }
      if (encoding !== undefined && typeof encoding !== 'string') {
        throw new TypeError('encoding must be a string')
      }
      if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
        throw new TypeError('Unknown encoding: ' + encoding)
      }
    } else if (typeof val === 'number') {
      val = val & 255
    }
  
    // Invalid ranges are not set to a default, so can range check early.
    if (start < 0 || this.length < start || this.length < end) {
      throw new RangeError('Out of range index')
    }
  
    if (end <= start) {
      return this
    }
  
    start = start >>> 0
    end = end === undefined ? this.length : end >>> 0
  
    if (!val) val = 0
  
    var i
    if (typeof val === 'number') {
      for (i = start; i < end; ++i) {
        this[i] = val
      }
    } else {
      var bytes = Buffer.isBuffer(val)
        ? val
        : utf8ToBytes(new Buffer(val, encoding).toString())
      var len = bytes.length
      for (i = 0; i < end - start; ++i) {
        this[i + start] = bytes[i % len]
      }
    }
  
    return this
  }
  
  // HELPER FUNCTIONS
  // ================
  
  var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g
  
  function base64clean (str) {
    // Node strips out invalid characters like \n and \t from the string, base64-js does not
    str = stringtrim(str).replace(INVALID_BASE64_RE, '')
    // Node converts strings with length < 2 to ''
    if (str.length < 2) return ''
    // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
    while (str.length % 4 !== 0) {
      str = str + '='
    }
    return str
  }
  
  function stringtrim (str) {
    if (str.trim) return str.trim()
    return str.replace(/^\s+|\s+$/g, '')
  }
  
  function toHex (n) {
    if (n < 16) return '0' + n.toString(16)
    return n.toString(16)
  }
  
  function utf8ToBytes (string, units) {
    units = units || Infinity
    var codePoint
    var length = string.length
    var leadSurrogate = null
    var bytes = []
  
    for (var i = 0; i < length; ++i) {
      codePoint = string.charCodeAt(i)
  
      // is surrogate component
      if (codePoint > 0xD7FF && codePoint < 0xE000) {
        // last char was a lead
        if (!leadSurrogate) {
          // no lead yet
          if (codePoint > 0xDBFF) {
            // unexpected trail
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            continue
          } else if (i + 1 === length) {
            // unpaired lead
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            continue
          }
  
          // valid lead
          leadSurrogate = codePoint
  
          continue
        }
  
        // 2 leads in a row
        if (codePoint < 0xDC00) {
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          leadSurrogate = codePoint
          continue
        }
  
        // valid surrogate pair
        codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
      } else if (leadSurrogate) {
        // valid bmp char, but last char was a lead
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
      }
  
      leadSurrogate = null
  
      // encode utf8
      if (codePoint < 0x80) {
        if ((units -= 1) < 0) break
        bytes.push(codePoint)
      } else if (codePoint < 0x800) {
        if ((units -= 2) < 0) break
        bytes.push(
          codePoint >> 0x6 | 0xC0,
          codePoint & 0x3F | 0x80
        )
      } else if (codePoint < 0x10000) {
        if ((units -= 3) < 0) break
        bytes.push(
          codePoint >> 0xC | 0xE0,
          codePoint >> 0x6 & 0x3F | 0x80,
          codePoint & 0x3F | 0x80
        )
      } else if (codePoint < 0x110000) {
        if ((units -= 4) < 0) break
        bytes.push(
          codePoint >> 0x12 | 0xF0,
          codePoint >> 0xC & 0x3F | 0x80,
          codePoint >> 0x6 & 0x3F | 0x80,
          codePoint & 0x3F | 0x80
        )
      } else {
        throw new Error('Invalid code point')
      }
    }
  
    return bytes
  }
  
  function asciiToBytes (str) {
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
      // Node's code seems to be doing this and not & 0x7F..
      byteArray.push(str.charCodeAt(i) & 0xFF)
    }
    return byteArray
  }
  
  function utf16leToBytes (str, units) {
    var c, hi, lo
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
      if ((units -= 2) < 0) break
  
      c = str.charCodeAt(i)
      hi = c >> 8
      lo = c % 256
      byteArray.push(lo)
      byteArray.push(hi)
    }
  
    return byteArray
  }
  
  function base64ToBytes (str) {
    return base64.toByteArray(base64clean(str))
  }
  
  function blitBuffer (src, dst, offset, length) {
    for (var i = 0; i < length; ++i) {
      if ((i + offset >= dst.length) || (i >= src.length)) break
      dst[i + offset] = src[i]
    }
    return i
  }
  
  function isnan (val) {
    return val !== val // eslint-disable-line no-self-compare
  }
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  
  },{"base64-js":51,"ieee754":52,"isarray":53}],51:[function(require,module,exports){
  'use strict'
  
  exports.byteLength = byteLength
  exports.toByteArray = toByteArray
  exports.fromByteArray = fromByteArray
  
  var lookup = []
  var revLookup = []
  var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
  
  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  for (var i = 0, len = code.length; i < len; ++i) {
    lookup[i] = code[i]
    revLookup[code.charCodeAt(i)] = i
  }
  
  revLookup['-'.charCodeAt(0)] = 62
  revLookup['_'.charCodeAt(0)] = 63
  
  function placeHoldersCount (b64) {
    var len = b64.length
    if (len % 4 > 0) {
      throw new Error('Invalid string. Length must be a multiple of 4')
    }
  
    // the number of equal signs (place holders)
    // if there are two placeholders, than the two characters before it
    // represent one byte
    // if there is only one, then the three characters before it represent 2 bytes
    // this is just a cheap hack to not do indexOf twice
    return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
  }
  
  function byteLength (b64) {
    // base64 is 4/3 + up to two characters of the original data
    return b64.length * 3 / 4 - placeHoldersCount(b64)
  }
  
  function toByteArray (b64) {
    var i, j, l, tmp, placeHolders, arr
    var len = b64.length
    placeHolders = placeHoldersCount(b64)
  
    arr = new Arr(len * 3 / 4 - placeHolders)
  
    // if there are placeholders, only get up to the last complete 4 chars
    l = placeHolders > 0 ? len - 4 : len
  
    var L = 0
  
    for (i = 0, j = 0; i < l; i += 4, j += 3) {
      tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
      arr[L++] = (tmp >> 16) & 0xFF
      arr[L++] = (tmp >> 8) & 0xFF
      arr[L++] = tmp & 0xFF
    }
  
    if (placeHolders === 2) {
      tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
      arr[L++] = tmp & 0xFF
    } else if (placeHolders === 1) {
      tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
      arr[L++] = (tmp >> 8) & 0xFF
      arr[L++] = tmp & 0xFF
    }
  
    return arr
  }
  
  function tripletToBase64 (num) {
    return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
  }
  
  function encodeChunk (uint8, start, end) {
    var tmp
    var output = []
    for (var i = start; i < end; i += 3) {
      tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
      output.push(tripletToBase64(tmp))
    }
    return output.join('')
  }
  
  function fromByteArray (uint8) {
    var tmp
    var len = uint8.length
    var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
    var output = ''
    var parts = []
    var maxChunkLength = 16383 // must be multiple of 3
  
    // go through the array every three bytes, we'll deal with trailing stuff later
    for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
      parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
    }
  
    // pad the end with zeros, but make sure to not forget the extra bytes
    if (extraBytes === 1) {
      tmp = uint8[len - 1]
      output += lookup[tmp >> 2]
      output += lookup[(tmp << 4) & 0x3F]
      output += '=='
    } else if (extraBytes === 2) {
      tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
      output += lookup[tmp >> 10]
      output += lookup[(tmp >> 4) & 0x3F]
      output += lookup[(tmp << 2) & 0x3F]
      output += '='
    }
  
    parts.push(output)
  
    return parts.join('')
  }
  
  },{}],52:[function(require,module,exports){
  exports.read = function (buffer, offset, isLE, mLen, nBytes) {
    var e, m
    var eLen = nBytes * 8 - mLen - 1
    var eMax = (1 << eLen) - 1
    var eBias = eMax >> 1
    var nBits = -7
    var i = isLE ? (nBytes - 1) : 0
    var d = isLE ? -1 : 1
    var s = buffer[offset + i]
  
    i += d
  
    e = s & ((1 << (-nBits)) - 1)
    s >>= (-nBits)
    nBits += eLen
    for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
  
    m = e & ((1 << (-nBits)) - 1)
    e >>= (-nBits)
    nBits += mLen
    for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
  
    if (e === 0) {
      e = 1 - eBias
    } else if (e === eMax) {
      return m ? NaN : ((s ? -1 : 1) * Infinity)
    } else {
      m = m + Math.pow(2, mLen)
      e = e - eBias
    }
    return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
  }
  
  exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
    var e, m, c
    var eLen = nBytes * 8 - mLen - 1
    var eMax = (1 << eLen) - 1
    var eBias = eMax >> 1
    var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
    var i = isLE ? 0 : (nBytes - 1)
    var d = isLE ? 1 : -1
    var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
  
    value = Math.abs(value)
  
    if (isNaN(value) || value === Infinity) {
      m = isNaN(value) ? 1 : 0
      e = eMax
    } else {
      e = Math.floor(Math.log(value) / Math.LN2)
      if (value * (c = Math.pow(2, -e)) < 1) {
        e--
        c *= 2
      }
      if (e + eBias >= 1) {
        value += rt / c
      } else {
        value += rt * Math.pow(2, 1 - eBias)
      }
      if (value * c >= 2) {
        e++
        c /= 2
      }
  
      if (e + eBias >= eMax) {
        m = 0
        e = eMax
      } else if (e + eBias >= 1) {
        m = (value * c - 1) * Math.pow(2, mLen)
        e = e + eBias
      } else {
        m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
        e = 0
      }
    }
  
    for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
  
    e = (e << mLen) | m
    eLen += mLen
    for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
  
    buffer[offset + i - d] |= s * 128
  }
  
  },{}],53:[function(require,module,exports){
  var toString = {}.toString;
  
  module.exports = Array.isArray || function (arr) {
    return toString.call(arr) == '[object Array]';
  };
  
  },{}],54:[function(require,module,exports){
  (function (global){
  /*! https://mths.be/punycode v1.4.1 by @mathias */
  ;(function(root) {
  
  	/** Detect free variables */
  	var freeExports = typeof exports == 'object' && exports &&
  		!exports.nodeType && exports;
  	var freeModule = typeof module == 'object' && module &&
  		!module.nodeType && module;
  	var freeGlobal = typeof global == 'object' && global;
  	if (
  		freeGlobal.global === freeGlobal ||
  		freeGlobal.window === freeGlobal ||
  		freeGlobal.self === freeGlobal
  	) {
  		root = freeGlobal;
  	}
  
  	/**
  	 * The `punycode` object.
  	 * @name punycode
  	 * @type Object
  	 */
  	var punycode,
  
  	/** Highest positive signed 32-bit float value */
  	maxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1
  
  	/** Bootstring parameters */
  	base = 36,
  	tMin = 1,
  	tMax = 26,
  	skew = 38,
  	damp = 700,
  	initialBias = 72,
  	initialN = 128, // 0x80
  	delimiter = '-', // '\x2D'
  
  	/** Regular expressions */
  	regexPunycode = /^xn--/,
  	regexNonASCII = /[^\x20-\x7E]/, // unprintable ASCII chars + non-ASCII chars
  	regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g, // RFC 3490 separators
  
  	/** Error messages */
  	errors = {
  		'overflow': 'Overflow: input needs wider integers to process',
  		'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
  		'invalid-input': 'Invalid input'
  	},
  
  	/** Convenience shortcuts */
  	baseMinusTMin = base - tMin,
  	floor = Math.floor,
  	stringFromCharCode = String.fromCharCode,
  
  	/** Temporary variable */
  	key;
  
  	/*--------------------------------------------------------------------------*/
  
  	/**
  	 * A generic error utility function.
  	 * @private
  	 * @param {String} type The error type.
  	 * @returns {Error} Throws a `RangeError` with the applicable error message.
  	 */
  	function error(type) {
  		throw new RangeError(errors[type]);
  	}
  
  	/**
  	 * A generic `Array#map` utility function.
  	 * @private
  	 * @param {Array} array The array to iterate over.
  	 * @param {Function} callback The function that gets called for every array
  	 * item.
  	 * @returns {Array} A new array of values returned by the callback function.
  	 */
  	function map(array, fn) {
  		var length = array.length;
  		var result = [];
  		while (length--) {
  			result[length] = fn(array[length]);
  		}
  		return result;
  	}
  
  	/**
  	 * A simple `Array#map`-like wrapper to work with domain name strings or email
  	 * addresses.
  	 * @private
  	 * @param {String} domain The domain name or email address.
  	 * @param {Function} callback The function that gets called for every
  	 * character.
  	 * @returns {Array} A new string of characters returned by the callback
  	 * function.
  	 */
  	function mapDomain(string, fn) {
  		var parts = string.split('@');
  		var result = '';
  		if (parts.length > 1) {
  			// In email addresses, only the domain name should be punycoded. Leave
  			// the local part (i.e. everything up to `@`) intact.
  			result = parts[0] + '@';
  			string = parts[1];
  		}
  		// Avoid `split(regex)` for IE8 compatibility. See #17.
  		string = string.replace(regexSeparators, '\x2E');
  		var labels = string.split('.');
  		var encoded = map(labels, fn).join('.');
  		return result + encoded;
  	}
  
  	/**
  	 * Creates an array containing the numeric code points of each Unicode
  	 * character in the string. While JavaScript uses UCS-2 internally,
  	 * this function will convert a pair of surrogate halves (each of which
  	 * UCS-2 exposes as separate characters) into a single code point,
  	 * matching UTF-16.
  	 * @see `punycode.ucs2.encode`
  	 * @see <https://mathiasbynens.be/notes/javascript-encoding>
  	 * @memberOf punycode.ucs2
  	 * @name decode
  	 * @param {String} string The Unicode input string (UCS-2).
  	 * @returns {Array} The new array of code points.
  	 */
  	function ucs2decode(string) {
  		var output = [],
  		    counter = 0,
  		    length = string.length,
  		    value,
  		    extra;
  		while (counter < length) {
  			value = string.charCodeAt(counter++);
  			if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
  				// high surrogate, and there is a next character
  				extra = string.charCodeAt(counter++);
  				if ((extra & 0xFC00) == 0xDC00) { // low surrogate
  					output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
  				} else {
  					// unmatched surrogate; only append this code unit, in case the next
  					// code unit is the high surrogate of a surrogate pair
  					output.push(value);
  					counter--;
  				}
  			} else {
  				output.push(value);
  			}
  		}
  		return output;
  	}
  
  	/**
  	 * Creates a string based on an array of numeric code points.
  	 * @see `punycode.ucs2.decode`
  	 * @memberOf punycode.ucs2
  	 * @name encode
  	 * @param {Array} codePoints The array of numeric code points.
  	 * @returns {String} The new Unicode string (UCS-2).
  	 */
  	function ucs2encode(array) {
  		return map(array, function(value) {
  			var output = '';
  			if (value > 0xFFFF) {
  				value -= 0x10000;
  				output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
  				value = 0xDC00 | value & 0x3FF;
  			}
  			output += stringFromCharCode(value);
  			return output;
  		}).join('');
  	}
  
  	/**
  	 * Converts a basic code point into a digit/integer.
  	 * @see `digitToBasic()`
  	 * @private
  	 * @param {Number} codePoint The basic numeric code point value.
  	 * @returns {Number} The numeric value of a basic code point (for use in
  	 * representing integers) in the range `0` to `base - 1`, or `base` if
  	 * the code point does not represent a value.
  	 */
  	function basicToDigit(codePoint) {
  		if (codePoint - 48 < 10) {
  			return codePoint - 22;
  		}
  		if (codePoint - 65 < 26) {
  			return codePoint - 65;
  		}
  		if (codePoint - 97 < 26) {
  			return codePoint - 97;
  		}
  		return base;
  	}
  
  	/**
  	 * Converts a digit/integer into a basic code point.
  	 * @see `basicToDigit()`
  	 * @private
  	 * @param {Number} digit The numeric value of a basic code point.
  	 * @returns {Number} The basic code point whose value (when used for
  	 * representing integers) is `digit`, which needs to be in the range
  	 * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
  	 * used; else, the lowercase form is used. The behavior is undefined
  	 * if `flag` is non-zero and `digit` has no uppercase form.
  	 */
  	function digitToBasic(digit, flag) {
  		//  0..25 map to ASCII a..z or A..Z
  		// 26..35 map to ASCII 0..9
  		return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
  	}
  
  	/**
  	 * Bias adaptation function as per section 3.4 of RFC 3492.
  	 * https://tools.ietf.org/html/rfc3492#section-3.4
  	 * @private
  	 */
  	function adapt(delta, numPoints, firstTime) {
  		var k = 0;
  		delta = firstTime ? floor(delta / damp) : delta >> 1;
  		delta += floor(delta / numPoints);
  		for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
  			delta = floor(delta / baseMinusTMin);
  		}
  		return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
  	}
  
  	/**
  	 * Converts a Punycode string of ASCII-only symbols to a string of Unicode
  	 * symbols.
  	 * @memberOf punycode
  	 * @param {String} input The Punycode string of ASCII-only symbols.
  	 * @returns {String} The resulting string of Unicode symbols.
  	 */
  	function decode(input) {
  		// Don't use UCS-2
  		var output = [],
  		    inputLength = input.length,
  		    out,
  		    i = 0,
  		    n = initialN,
  		    bias = initialBias,
  		    basic,
  		    j,
  		    index,
  		    oldi,
  		    w,
  		    k,
  		    digit,
  		    t,
  		    /** Cached calculation results */
  		    baseMinusT;
  
  		// Handle the basic code points: let `basic` be the number of input code
  		// points before the last delimiter, or `0` if there is none, then copy
  		// the first basic code points to the output.
  
  		basic = input.lastIndexOf(delimiter);
  		if (basic < 0) {
  			basic = 0;
  		}
  
  		for (j = 0; j < basic; ++j) {
  			// if it's not a basic code point
  			if (input.charCodeAt(j) >= 0x80) {
  				error('not-basic');
  			}
  			output.push(input.charCodeAt(j));
  		}
  
  		// Main decoding loop: start just after the last delimiter if any basic code
  		// points were copied; start at the beginning otherwise.
  
  		for (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {
  
  			// `index` is the index of the next character to be consumed.
  			// Decode a generalized variable-length integer into `delta`,
  			// which gets added to `i`. The overflow checking is easier
  			// if we increase `i` as we go, then subtract off its starting
  			// value at the end to obtain `delta`.
  			for (oldi = i, w = 1, k = base; /* no condition */; k += base) {
  
  				if (index >= inputLength) {
  					error('invalid-input');
  				}
  
  				digit = basicToDigit(input.charCodeAt(index++));
  
  				if (digit >= base || digit > floor((maxInt - i) / w)) {
  					error('overflow');
  				}
  
  				i += digit * w;
  				t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
  
  				if (digit < t) {
  					break;
  				}
  
  				baseMinusT = base - t;
  				if (w > floor(maxInt / baseMinusT)) {
  					error('overflow');
  				}
  
  				w *= baseMinusT;
  
  			}
  
  			out = output.length + 1;
  			bias = adapt(i - oldi, out, oldi == 0);
  
  			// `i` was supposed to wrap around from `out` to `0`,
  			// incrementing `n` each time, so we'll fix that now:
  			if (floor(i / out) > maxInt - n) {
  				error('overflow');
  			}
  
  			n += floor(i / out);
  			i %= out;
  
  			// Insert `n` at position `i` of the output
  			output.splice(i++, 0, n);
  
  		}
  
  		return ucs2encode(output);
  	}
  
  	/**
  	 * Converts a string of Unicode symbols (e.g. a domain name label) to a
  	 * Punycode string of ASCII-only symbols.
  	 * @memberOf punycode
  	 * @param {String} input The string of Unicode symbols.
  	 * @returns {String} The resulting Punycode string of ASCII-only symbols.
  	 */
  	function encode(input) {
  		var n,
  		    delta,
  		    handledCPCount,
  		    basicLength,
  		    bias,
  		    j,
  		    m,
  		    q,
  		    k,
  		    t,
  		    currentValue,
  		    output = [],
  		    /** `inputLength` will hold the number of code points in `input`. */
  		    inputLength,
  		    /** Cached calculation results */
  		    handledCPCountPlusOne,
  		    baseMinusT,
  		    qMinusT;
  
  		// Convert the input in UCS-2 to Unicode
  		input = ucs2decode(input);
  
  		// Cache the length
  		inputLength = input.length;
  
  		// Initialize the state
  		n = initialN;
  		delta = 0;
  		bias = initialBias;
  
  		// Handle the basic code points
  		for (j = 0; j < inputLength; ++j) {
  			currentValue = input[j];
  			if (currentValue < 0x80) {
  				output.push(stringFromCharCode(currentValue));
  			}
  		}
  
  		handledCPCount = basicLength = output.length;
  
  		// `handledCPCount` is the number of code points that have been handled;
  		// `basicLength` is the number of basic code points.
  
  		// Finish the basic string - if it is not empty - with a delimiter
  		if (basicLength) {
  			output.push(delimiter);
  		}
  
  		// Main encoding loop:
  		while (handledCPCount < inputLength) {
  
  			// All non-basic code points < n have been handled already. Find the next
  			// larger one:
  			for (m = maxInt, j = 0; j < inputLength; ++j) {
  				currentValue = input[j];
  				if (currentValue >= n && currentValue < m) {
  					m = currentValue;
  				}
  			}
  
  			// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
  			// but guard against overflow
  			handledCPCountPlusOne = handledCPCount + 1;
  			if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
  				error('overflow');
  			}
  
  			delta += (m - n) * handledCPCountPlusOne;
  			n = m;
  
  			for (j = 0; j < inputLength; ++j) {
  				currentValue = input[j];
  
  				if (currentValue < n && ++delta > maxInt) {
  					error('overflow');
  				}
  
  				if (currentValue == n) {
  					// Represent delta as a generalized variable-length integer
  					for (q = delta, k = base; /* no condition */; k += base) {
  						t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
  						if (q < t) {
  							break;
  						}
  						qMinusT = q - t;
  						baseMinusT = base - t;
  						output.push(
  							stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
  						);
  						q = floor(qMinusT / baseMinusT);
  					}
  
  					output.push(stringFromCharCode(digitToBasic(q, 0)));
  					bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
  					delta = 0;
  					++handledCPCount;
  				}
  			}
  
  			++delta;
  			++n;
  
  		}
  		return output.join('');
  	}
  
  	/**
  	 * Converts a Punycode string representing a domain name or an email address
  	 * to Unicode. Only the Punycoded parts of the input will be converted, i.e.
  	 * it doesn't matter if you call it on a string that has already been
  	 * converted to Unicode.
  	 * @memberOf punycode
  	 * @param {String} input The Punycoded domain name or email address to
  	 * convert to Unicode.
  	 * @returns {String} The Unicode representation of the given Punycode
  	 * string.
  	 */
  	function toUnicode(input) {
  		return mapDomain(input, function(string) {
  			return regexPunycode.test(string)
  				? decode(string.slice(4).toLowerCase())
  				: string;
  		});
  	}
  
  	/**
  	 * Converts a Unicode string representing a domain name or an email address to
  	 * Punycode. Only the non-ASCII parts of the domain name will be converted,
  	 * i.e. it doesn't matter if you call it with a domain that's already in
  	 * ASCII.
  	 * @memberOf punycode
  	 * @param {String} input The domain name or email address to convert, as a
  	 * Unicode string.
  	 * @returns {String} The Punycode representation of the given domain name or
  	 * email address.
  	 */
  	function toASCII(input) {
  		return mapDomain(input, function(string) {
  			return regexNonASCII.test(string)
  				? 'xn--' + encode(string)
  				: string;
  		});
  	}
  
  	/*--------------------------------------------------------------------------*/
  
  	/** Define the public API */
  	punycode = {
  		/**
  		 * A string representing the current Punycode.js version number.
  		 * @memberOf punycode
  		 * @type String
  		 */
  		'version': '1.4.1',
  		/**
  		 * An object of methods to convert from JavaScript's internal character
  		 * representation (UCS-2) to Unicode code points, and back.
  		 * @see <https://mathiasbynens.be/notes/javascript-encoding>
  		 * @memberOf punycode
  		 * @type Object
  		 */
  		'ucs2': {
  			'decode': ucs2decode,
  			'encode': ucs2encode
  		},
  		'decode': decode,
  		'encode': encode,
  		'toASCII': toASCII,
  		'toUnicode': toUnicode
  	};
  
  	/** Expose `punycode` */
  	// Some AMD build optimizers, like r.js, check for specific condition patterns
  	// like the following:
  	if (
  		typeof define == 'function' &&
  		typeof define.amd == 'object' &&
  		define.amd
  	) {
  		define('punycode', function() {
  			return punycode;
  		});
  	} else if (freeExports && freeModule) {
  		if (module.exports == freeExports) {
  			// in Node.js, io.js, or RingoJS v0.8.0+
  			freeModule.exports = punycode;
  		} else {
  			// in Narwhal or RingoJS v0.7.0-
  			for (key in punycode) {
  				punycode.hasOwnProperty(key) && (freeExports[key] = punycode[key]);
  			}
  		}
  	} else {
  		// in Rhino or a web browser
  		root.punycode = punycode;
  	}
  
  }(this));
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  
  },{}],55:[function(require,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.
  
  'use strict';
  
  // If obj.hasOwnProperty has been overridden, then calling
  // obj.hasOwnProperty(prop) will break.
  // See: https://github.com/joyent/node/issues/1707
  function hasOwnProperty(obj, prop) {
    return Object.prototype.hasOwnProperty.call(obj, prop);
  }
  
  module.exports = function(qs, sep, eq, options) {
    sep = sep || '&';
    eq = eq || '=';
    var obj = {};
  
    if (typeof qs !== 'string' || qs.length === 0) {
      return obj;
    }
  
    var regexp = /\+/g;
    qs = qs.split(sep);
  
    var maxKeys = 1000;
    if (options && typeof options.maxKeys === 'number') {
      maxKeys = options.maxKeys;
    }
  
    var len = qs.length;
    // maxKeys <= 0 means that we should not limit keys count
    if (maxKeys > 0 && len > maxKeys) {
      len = maxKeys;
    }
  
    for (var i = 0; i < len; ++i) {
      var x = qs[i].replace(regexp, '%20'),
          idx = x.indexOf(eq),
          kstr, vstr, k, v;
  
      if (idx >= 0) {
        kstr = x.substr(0, idx);
        vstr = x.substr(idx + 1);
      } else {
        kstr = x;
        vstr = '';
      }
  
      k = decodeURIComponent(kstr);
      v = decodeURIComponent(vstr);
  
      if (!hasOwnProperty(obj, k)) {
        obj[k] = v;
      } else if (isArray(obj[k])) {
        obj[k].push(v);
      } else {
        obj[k] = [obj[k], v];
      }
    }
  
    return obj;
  };
  
  var isArray = Array.isArray || function (xs) {
    return Object.prototype.toString.call(xs) === '[object Array]';
  };
  
  },{}],56:[function(require,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.
  
  'use strict';
  
  var stringifyPrimitive = function(v) {
    switch (typeof v) {
      case 'string':
        return v;
  
      case 'boolean':
        return v ? 'true' : 'false';
  
      case 'number':
        return isFinite(v) ? v : '';
  
      default:
        return '';
    }
  };
  
  module.exports = function(obj, sep, eq, name) {
    sep = sep || '&';
    eq = eq || '=';
    if (obj === null) {
      obj = undefined;
    }
  
    if (typeof obj === 'object') {
      return map(objectKeys(obj), function(k) {
        var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;
        if (isArray(obj[k])) {
          return map(obj[k], function(v) {
            return ks + encodeURIComponent(stringifyPrimitive(v));
          }).join(sep);
        } else {
          return ks + encodeURIComponent(stringifyPrimitive(obj[k]));
        }
      }).join(sep);
  
    }
  
    if (!name) return '';
    return encodeURIComponent(stringifyPrimitive(name)) + eq +
           encodeURIComponent(stringifyPrimitive(obj));
  };
  
  var isArray = Array.isArray || function (xs) {
    return Object.prototype.toString.call(xs) === '[object Array]';
  };
  
  function map (xs, f) {
    if (xs.map) return xs.map(f);
    var res = [];
    for (var i = 0; i < xs.length; i++) {
      res.push(f(xs[i], i));
    }
    return res;
  }
  
  var objectKeys = Object.keys || function (obj) {
    var res = [];
    for (var key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key)) res.push(key);
    }
    return res;
  };
  
  },{}],57:[function(require,module,exports){
  'use strict';
  
  exports.decode = exports.parse = require('./decode');
  exports.encode = exports.stringify = require('./encode');
  
  },{"./decode":55,"./encode":56}],58:[function(require,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.
  
  'use strict';
  
  var punycode = require('punycode');
  var util = require('./util');
  
  exports.parse = urlParse;
  exports.resolve = urlResolve;
  exports.resolveObject = urlResolveObject;
  exports.format = urlFormat;
  
  exports.Url = Url;
  
  function Url() {
    this.protocol = null;
    this.slashes = null;
    this.auth = null;
    this.host = null;
    this.port = null;
    this.hostname = null;
    this.hash = null;
    this.search = null;
    this.query = null;
    this.pathname = null;
    this.path = null;
    this.href = null;
  }
  
  // Reference: RFC 3986, RFC 1808, RFC 2396
  
  // define these here so at least they only have to be
  // compiled once on the first module load.
  var protocolPattern = /^([a-z0-9.+-]+:)/i,
      portPattern = /:[0-9]*$/,
  
      // Special case for a simple path URL
      simplePathPattern = /^(\/\/?(?!\/)[^\?\s]*)(\?[^\s]*)?$/,
  
      // RFC 2396: characters reserved for delimiting URLs.
      // We actually just auto-escape these.
      delims = ['<', '>', '"', '`', ' ', '\r', '\n', '\t'],
  
      // RFC 2396: characters not allowed for various reasons.
      unwise = ['{', '}', '|', '\\', '^', '`'].concat(delims),
  
      // Allowed by RFCs, but cause of XSS attacks.  Always escape these.
      autoEscape = ['\''].concat(unwise),
      // Characters that are never ever allowed in a hostname.
      // Note that any invalid chars are also handled, but these
      // are the ones that are *expected* to be seen, so we fast-path
      // them.
      nonHostChars = ['%', '/', '?', ';', '#'].concat(autoEscape),
      hostEndingChars = ['/', '?', '#'],
      hostnameMaxLen = 255,
      hostnamePartPattern = /^[+a-z0-9A-Z_-]{0,63}$/,
      hostnamePartStart = /^([+a-z0-9A-Z_-]{0,63})(.*)$/,
      // protocols that can allow "unsafe" and "unwise" chars.
      unsafeProtocol = {
        'javascript': true,
        'javascript:': true
      },
      // protocols that never have a hostname.
      hostlessProtocol = {
        'javascript': true,
        'javascript:': true
      },
      // protocols that always contain a // bit.
      slashedProtocol = {
        'http': true,
        'https': true,
        'ftp': true,
        'gopher': true,
        'file': true,
        'http:': true,
        'https:': true,
        'ftp:': true,
        'gopher:': true,
        'file:': true
      },
      querystring = require('querystring');
  
  function urlParse(url, parseQueryString, slashesDenoteHost) {
    if (url && util.isObject(url) && url instanceof Url) return url;
  
    var u = new Url;
    u.parse(url, parseQueryString, slashesDenoteHost);
    return u;
  }
  
  Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
    if (!util.isString(url)) {
      throw new TypeError("Parameter 'url' must be a string, not " + typeof url);
    }
  
    // Copy chrome, IE, opera backslash-handling behavior.
    // Back slashes before the query string get converted to forward slashes
    // See: https://code.google.com/p/chromium/issues/detail?id=25916
    var queryIndex = url.indexOf('?'),
        splitter =
            (queryIndex !== -1 && queryIndex < url.indexOf('#')) ? '?' : '#',
        uSplit = url.split(splitter),
        slashRegex = /\\/g;
    uSplit[0] = uSplit[0].replace(slashRegex, '/');
    url = uSplit.join(splitter);
  
    var rest = url;
  
    // trim before proceeding.
    // This is to support parse stuff like "  http://foo.com  \n"
    rest = rest.trim();
  
    if (!slashesDenoteHost && url.split('#').length === 1) {
      // Try fast path regexp
      var simplePath = simplePathPattern.exec(rest);
      if (simplePath) {
        this.path = rest;
        this.href = rest;
        this.pathname = simplePath[1];
        if (simplePath[2]) {
          this.search = simplePath[2];
          if (parseQueryString) {
            this.query = querystring.parse(this.search.substr(1));
          } else {
            this.query = this.search.substr(1);
          }
        } else if (parseQueryString) {
          this.search = '';
          this.query = {};
        }
        return this;
      }
    }
  
    var proto = protocolPattern.exec(rest);
    if (proto) {
      proto = proto[0];
      var lowerProto = proto.toLowerCase();
      this.protocol = lowerProto;
      rest = rest.substr(proto.length);
    }
  
    // figure out if it's got a host
    // user@server is *always* interpreted as a hostname, and url
    // resolution will treat //foo/bar as host=foo,path=bar because that's
    // how the browser resolves relative URLs.
    if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) {
      var slashes = rest.substr(0, 2) === '//';
      if (slashes && !(proto && hostlessProtocol[proto])) {
        rest = rest.substr(2);
        this.slashes = true;
      }
    }
  
    if (!hostlessProtocol[proto] &&
        (slashes || (proto && !slashedProtocol[proto]))) {
  
      // there's a hostname.
      // the first instance of /, ?, ;, or # ends the host.
      //
      // If there is an @ in the hostname, then non-host chars *are* allowed
      // to the left of the last @ sign, unless some host-ending character
      // comes *before* the @-sign.
      // URLs are obnoxious.
      //
      // ex:
      // http://a@b@c/ => user:a@b host:c
      // http://a@b?@c => user:a host:c path:/?@c
  
      // v0.12 TODO(isaacs): This is not quite how Chrome does things.
      // Review our test case against browsers more comprehensively.
  
      // find the first instance of any hostEndingChars
      var hostEnd = -1;
      for (var i = 0; i < hostEndingChars.length; i++) {
        var hec = rest.indexOf(hostEndingChars[i]);
        if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
          hostEnd = hec;
      }
  
      // at this point, either we have an explicit point where the
      // auth portion cannot go past, or the last @ char is the decider.
      var auth, atSign;
      if (hostEnd === -1) {
        // atSign can be anywhere.
        atSign = rest.lastIndexOf('@');
      } else {
        // atSign must be in auth portion.
        // http://a@b/c@d => host:b auth:a path:/c@d
        atSign = rest.lastIndexOf('@', hostEnd);
      }
  
      // Now we have a portion which is definitely the auth.
      // Pull that off.
      if (atSign !== -1) {
        auth = rest.slice(0, atSign);
        rest = rest.slice(atSign + 1);
        this.auth = decodeURIComponent(auth);
      }
  
      // the host is the remaining to the left of the first non-host char
      hostEnd = -1;
      for (var i = 0; i < nonHostChars.length; i++) {
        var hec = rest.indexOf(nonHostChars[i]);
        if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
          hostEnd = hec;
      }
      // if we still have not hit it, then the entire thing is a host.
      if (hostEnd === -1)
        hostEnd = rest.length;
  
      this.host = rest.slice(0, hostEnd);
      rest = rest.slice(hostEnd);
  
      // pull out port.
      this.parseHost();
  
      // we've indicated that there is a hostname,
      // so even if it's empty, it has to be present.
      this.hostname = this.hostname || '';
  
      // if hostname begins with [ and ends with ]
      // assume that it's an IPv6 address.
      var ipv6Hostname = this.hostname[0] === '[' &&
          this.hostname[this.hostname.length - 1] === ']';
  
      // validate a little.
      if (!ipv6Hostname) {
        var hostparts = this.hostname.split(/\./);
        for (var i = 0, l = hostparts.length; i < l; i++) {
          var part = hostparts[i];
          if (!part) continue;
          if (!part.match(hostnamePartPattern)) {
            var newpart = '';
            for (var j = 0, k = part.length; j < k; j++) {
              if (part.charCodeAt(j) > 127) {
                // we replace non-ASCII char with a temporary placeholder
                // we need this to make sure size of hostname is not
                // broken by replacing non-ASCII by nothing
                newpart += 'x';
              } else {
                newpart += part[j];
              }
            }
            // we test again with ASCII char only
            if (!newpart.match(hostnamePartPattern)) {
              var validParts = hostparts.slice(0, i);
              var notHost = hostparts.slice(i + 1);
              var bit = part.match(hostnamePartStart);
              if (bit) {
                validParts.push(bit[1]);
                notHost.unshift(bit[2]);
              }
              if (notHost.length) {
                rest = '/' + notHost.join('.') + rest;
              }
              this.hostname = validParts.join('.');
              break;
            }
          }
        }
      }
  
      if (this.hostname.length > hostnameMaxLen) {
        this.hostname = '';
      } else {
        // hostnames are always lower case.
        this.hostname = this.hostname.toLowerCase();
      }
  
      if (!ipv6Hostname) {
        // IDNA Support: Returns a punycoded representation of "domain".
        // It only converts parts of the domain name that
        // have non-ASCII characters, i.e. it doesn't matter if
        // you call it with a domain that already is ASCII-only.
        this.hostname = punycode.toASCII(this.hostname);
      }
  
      var p = this.port ? ':' + this.port : '';
      var h = this.hostname || '';
      this.host = h + p;
      this.href += this.host;
  
      // strip [ and ] from the hostname
      // the host field still retains them, though
      if (ipv6Hostname) {
        this.hostname = this.hostname.substr(1, this.hostname.length - 2);
        if (rest[0] !== '/') {
          rest = '/' + rest;
        }
      }
    }
  
    // now rest is set to the post-host stuff.
    // chop off any delim chars.
    if (!unsafeProtocol[lowerProto]) {
  
      // First, make 100% sure that any "autoEscape" chars get
      // escaped, even if encodeURIComponent doesn't think they
      // need to be.
      for (var i = 0, l = autoEscape.length; i < l; i++) {
        var ae = autoEscape[i];
        if (rest.indexOf(ae) === -1)
          continue;
        var esc = encodeURIComponent(ae);
        if (esc === ae) {
          esc = escape(ae);
        }
        rest = rest.split(ae).join(esc);
      }
    }
  
  
    // chop off from the tail first.
    var hash = rest.indexOf('#');
    if (hash !== -1) {
      // got a fragment string.
      this.hash = rest.substr(hash);
      rest = rest.slice(0, hash);
    }
    var qm = rest.indexOf('?');
    if (qm !== -1) {
      this.search = rest.substr(qm);
      this.query = rest.substr(qm + 1);
      if (parseQueryString) {
        this.query = querystring.parse(this.query);
      }
      rest = rest.slice(0, qm);
    } else if (parseQueryString) {
      // no query string, but parseQueryString still requested
      this.search = '';
      this.query = {};
    }
    if (rest) this.pathname = rest;
    if (slashedProtocol[lowerProto] &&
        this.hostname && !this.pathname) {
      this.pathname = '/';
    }
  
    //to support http.request
    if (this.pathname || this.search) {
      var p = this.pathname || '';
      var s = this.search || '';
      this.path = p + s;
    }
  
    // finally, reconstruct the href based on what has been validated.
    this.href = this.format();
    return this;
  };
  
  // format a parsed object into a url string
  function urlFormat(obj) {
    // ensure it's an object, and not a string url.
    // If it's an obj, this is a no-op.
    // this way, you can call url_format() on strings
    // to clean up potentially wonky urls.
    if (util.isString(obj)) obj = urlParse(obj);
    if (!(obj instanceof Url)) return Url.prototype.format.call(obj);
    return obj.format();
  }
  
  Url.prototype.format = function() {
    var auth = this.auth || '';
    if (auth) {
      auth = encodeURIComponent(auth);
      auth = auth.replace(/%3A/i, ':');
      auth += '@';
    }
  
    var protocol = this.protocol || '',
        pathname = this.pathname || '',
        hash = this.hash || '',
        host = false,
        query = '';
  
    if (this.host) {
      host = auth + this.host;
    } else if (this.hostname) {
      host = auth + (this.hostname.indexOf(':') === -1 ?
          this.hostname :
          '[' + this.hostname + ']');
      if (this.port) {
        host += ':' + this.port;
      }
    }
  
    if (this.query &&
        util.isObject(this.query) &&
        Object.keys(this.query).length) {
      query = querystring.stringify(this.query);
    }
  
    var search = this.search || (query && ('?' + query)) || '';
  
    if (protocol && protocol.substr(-1) !== ':') protocol += ':';
  
    // only the slashedProtocols get the //.  Not mailto:, xmpp:, etc.
    // unless they had them to begin with.
    if (this.slashes ||
        (!protocol || slashedProtocol[protocol]) && host !== false) {
      host = '//' + (host || '');
      if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname;
    } else if (!host) {
      host = '';
    }
  
    if (hash && hash.charAt(0) !== '#') hash = '#' + hash;
    if (search && search.charAt(0) !== '?') search = '?' + search;
  
    pathname = pathname.replace(/[?#]/g, function(match) {
      return encodeURIComponent(match);
    });
    search = search.replace('#', '%23');
  
    return protocol + host + pathname + search + hash;
  };
  
  function urlResolve(source, relative) {
    return urlParse(source, false, true).resolve(relative);
  }
  
  Url.prototype.resolve = function(relative) {
    return this.resolveObject(urlParse(relative, false, true)).format();
  };
  
  function urlResolveObject(source, relative) {
    if (!source) return relative;
    return urlParse(source, false, true).resolveObject(relative);
  }
  
  Url.prototype.resolveObject = function(relative) {
    if (util.isString(relative)) {
      var rel = new Url();
      rel.parse(relative, false, true);
      relative = rel;
    }
  
    var result = new Url();
    var tkeys = Object.keys(this);
    for (var tk = 0; tk < tkeys.length; tk++) {
      var tkey = tkeys[tk];
      result[tkey] = this[tkey];
    }
  
    // hash is always overridden, no matter what.
    // even href="" will remove it.
    result.hash = relative.hash;
  
    // if the relative url is empty, then there's nothing left to do here.
    if (relative.href === '') {
      result.href = result.format();
      return result;
    }
  
    // hrefs like //foo/bar always cut to the protocol.
    if (relative.slashes && !relative.protocol) {
      // take everything except the protocol from relative
      var rkeys = Object.keys(relative);
      for (var rk = 0; rk < rkeys.length; rk++) {
        var rkey = rkeys[rk];
        if (rkey !== 'protocol')
          result[rkey] = relative[rkey];
      }
  
      //urlParse appends trailing / to urls like http://www.example.com
      if (slashedProtocol[result.protocol] &&
          result.hostname && !result.pathname) {
        result.path = result.pathname = '/';
      }
  
      result.href = result.format();
      return result;
    }
  
    if (relative.protocol && relative.protocol !== result.protocol) {
      // if it's a known url protocol, then changing
      // the protocol does weird things
      // first, if it's not file:, then we MUST have a host,
      // and if there was a path
      // to begin with, then we MUST have a path.
      // if it is file:, then the host is dropped,
      // because that's known to be hostless.
      // anything else is assumed to be absolute.
      if (!slashedProtocol[relative.protocol]) {
        var keys = Object.keys(relative);
        for (var v = 0; v < keys.length; v++) {
          var k = keys[v];
          result[k] = relative[k];
        }
        result.href = result.format();
        return result;
      }
  
      result.protocol = relative.protocol;
      if (!relative.host && !hostlessProtocol[relative.protocol]) {
        var relPath = (relative.pathname || '').split('/');
        while (relPath.length && !(relative.host = relPath.shift()));
        if (!relative.host) relative.host = '';
        if (!relative.hostname) relative.hostname = '';
        if (relPath[0] !== '') relPath.unshift('');
        if (relPath.length < 2) relPath.unshift('');
        result.pathname = relPath.join('/');
      } else {
        result.pathname = relative.pathname;
      }
      result.search = relative.search;
      result.query = relative.query;
      result.host = relative.host || '';
      result.auth = relative.auth;
      result.hostname = relative.hostname || relative.host;
      result.port = relative.port;
      // to support http.request
      if (result.pathname || result.search) {
        var p = result.pathname || '';
        var s = result.search || '';
        result.path = p + s;
      }
      result.slashes = result.slashes || relative.slashes;
      result.href = result.format();
      return result;
    }
  
    var isSourceAbs = (result.pathname && result.pathname.charAt(0) === '/'),
        isRelAbs = (
            relative.host ||
            relative.pathname && relative.pathname.charAt(0) === '/'
        ),
        mustEndAbs = (isRelAbs || isSourceAbs ||
                      (result.host && relative.pathname)),
        removeAllDots = mustEndAbs,
        srcPath = result.pathname && result.pathname.split('/') || [],
        relPath = relative.pathname && relative.pathname.split('/') || [],
        psychotic = result.protocol && !slashedProtocol[result.protocol];
  
    // if the url is a non-slashed url, then relative
    // links like ../.. should be able
    // to crawl up to the hostname, as well.  This is strange.
    // result.protocol has already been set by now.
    // Later on, put the first path part into the host field.
    if (psychotic) {
      result.hostname = '';
      result.port = null;
      if (result.host) {
        if (srcPath[0] === '') srcPath[0] = result.host;
        else srcPath.unshift(result.host);
      }
      result.host = '';
      if (relative.protocol) {
        relative.hostname = null;
        relative.port = null;
        if (relative.host) {
          if (relPath[0] === '') relPath[0] = relative.host;
          else relPath.unshift(relative.host);
        }
        relative.host = null;
      }
      mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');
    }
  
    if (isRelAbs) {
      // it's absolute.
      result.host = (relative.host || relative.host === '') ?
                    relative.host : result.host;
      result.hostname = (relative.hostname || relative.hostname === '') ?
                        relative.hostname : result.hostname;
      result.search = relative.search;
      result.query = relative.query;
      srcPath = relPath;
      // fall through to the dot-handling below.
    } else if (relPath.length) {
      // it's relative
      // throw away the existing file, and take the new path instead.
      if (!srcPath) srcPath = [];
      srcPath.pop();
      srcPath = srcPath.concat(relPath);
      result.search = relative.search;
      result.query = relative.query;
    } else if (!util.isNullOrUndefined(relative.search)) {
      // just pull out the search.
      // like href='?foo'.
      // Put this after the other two cases because it simplifies the booleans
      if (psychotic) {
        result.hostname = result.host = srcPath.shift();
        //occationaly the auth can get stuck only in host
        //this especially happens in cases like
        //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
        var authInHost = result.host && result.host.indexOf('@') > 0 ?
                         result.host.split('@') : false;
        if (authInHost) {
          result.auth = authInHost.shift();
          result.host = result.hostname = authInHost.shift();
        }
      }
      result.search = relative.search;
      result.query = relative.query;
      //to support http.request
      if (!util.isNull(result.pathname) || !util.isNull(result.search)) {
        result.path = (result.pathname ? result.pathname : '') +
                      (result.search ? result.search : '');
      }
      result.href = result.format();
      return result;
    }
  
    if (!srcPath.length) {
      // no path at all.  easy.
      // we've already handled the other stuff above.
      result.pathname = null;
      //to support http.request
      if (result.search) {
        result.path = '/' + result.search;
      } else {
        result.path = null;
      }
      result.href = result.format();
      return result;
    }
  
    // if a url ENDs in . or .., then it must get a trailing slash.
    // however, if it ends in anything else non-slashy,
    // then it must NOT get a trailing slash.
    var last = srcPath.slice(-1)[0];
    var hasTrailingSlash = (
        (result.host || relative.host || srcPath.length > 1) &&
        (last === '.' || last === '..') || last === '');
  
    // strip single dots, resolve double dots to parent dir
    // if the path tries to go above the root, `up` ends up > 0
    var up = 0;
    for (var i = srcPath.length; i >= 0; i--) {
      last = srcPath[i];
      if (last === '.') {
        srcPath.splice(i, 1);
      } else if (last === '..') {
        srcPath.splice(i, 1);
        up++;
      } else if (up) {
        srcPath.splice(i, 1);
        up--;
      }
    }
  
    // if the path is allowed to go above the root, restore leading ..s
    if (!mustEndAbs && !removeAllDots) {
      for (; up--; up) {
        srcPath.unshift('..');
      }
    }
  
    if (mustEndAbs && srcPath[0] !== '' &&
        (!srcPath[0] || srcPath[0].charAt(0) !== '/')) {
      srcPath.unshift('');
    }
  
    if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {
      srcPath.push('');
    }
  
    var isAbsolute = srcPath[0] === '' ||
        (srcPath[0] && srcPath[0].charAt(0) === '/');
  
    // put the host back
    if (psychotic) {
      result.hostname = result.host = isAbsolute ? '' :
                                      srcPath.length ? srcPath.shift() : '';
      //occationaly the auth can get stuck only in host
      //this especially happens in cases like
      //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
      var authInHost = result.host && result.host.indexOf('@') > 0 ?
                       result.host.split('@') : false;
      if (authInHost) {
        result.auth = authInHost.shift();
        result.host = result.hostname = authInHost.shift();
      }
    }
  
    mustEndAbs = mustEndAbs || (result.host && srcPath.length);
  
    if (mustEndAbs && !isAbsolute) {
      srcPath.unshift('');
    }
  
    if (!srcPath.length) {
      result.pathname = null;
      result.path = null;
    } else {
      result.pathname = srcPath.join('/');
    }
  
    //to support request.http
    if (!util.isNull(result.pathname) || !util.isNull(result.search)) {
      result.path = (result.pathname ? result.pathname : '') +
                    (result.search ? result.search : '');
    }
    result.auth = relative.auth || result.auth;
    result.slashes = result.slashes || relative.slashes;
    result.href = result.format();
    return result;
  };
  
  Url.prototype.parseHost = function() {
    var host = this.host;
    var port = portPattern.exec(host);
    if (port) {
      port = port[0];
      if (port !== ':') {
        this.port = port.substr(1);
      }
      host = host.substr(0, host.length - port.length);
    }
    if (host) this.hostname = host;
  };
  
  },{"./util":59,"punycode":54,"querystring":57}],59:[function(require,module,exports){
  'use strict';
  
  module.exports = {
    isString: function(arg) {
      return typeof(arg) === 'string';
    },
    isObject: function(arg) {
      return typeof(arg) === 'object' && arg !== null;
    },
    isNull: function(arg) {
      return arg === null;
    },
    isNullOrUndefined: function(arg) {
      return arg == null;
    }
  };
  
  },{}]},{},[5])(5)
  });
  //# sourceMappingURL=postman-bdd.js.map
  