text: /** vim: et:ts=4:sw=4:sts=4
  * @license RequireJS 2.1.9 Copyright (c) 2010-2012, The Dojo Foundation All Rights Reserved.
  * Available via the MIT or new BSD license.
  * see: http://github.com/jrburke/requirejs for details
  */
  //Not using strict: uneven strict support in browsers, #392, and causes
  //problems with requirejs.exec()/transpiler plugins that may not be strict.
  /*jslint regexp: true, nomen: true, sloppy: true */
  /*global window, navigator, document, importScripts, setTimeout, opera */
  
  var requirejs, require, define;
  (function (global) {
    var req, s, head, baseElement, dataMain, src,
          interactiveScript, currentlyAddingScript, mainScript, subPath,
          version = '2.1.9',
          commentRegExp = /(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg,
          cjsRequireRegExp = /[^.]\s*require\s*\(\s*["']([^'"\s]+)["']\s*\)/g,
          jsSuffixRegExp = /\.js$/,
          currDirRegExp = /^\.\//,
          op = Object.prototype,
          ostring = op.toString,
          hasOwn = op.hasOwnProperty,
          ap = Array.prototype,
          apsp = ap.splice,
          isBrowser = !!(typeof window !== 'undefined' && typeof navigator !== 'undefined' && window.document),
          isWebWorker = !isBrowser && typeof importScripts !== 'undefined',
    //PS3 indicates loaded and complete, but need to wait for complete
    //specifically. Sequence is 'loading', 'loaded', execution,
    // then 'complete'. The UA check is unfortunate, but not sure how
    //to feature test w/o causing perf issues.
          readyRegExp = isBrowser && navigator.platform === 'PLAYSTATION 3' ?
                        /^complete$/ : /^(complete|loaded)$/,
          defContextName = '_',
    //Oh the tragedy, detecting opera. See the usage of isOpera for reason.
          isOpera = typeof opera !== 'undefined' && opera.toString() === '[object Opera]',
          contexts = {},
          cfg = {},
          globalDefQueue = [],
          useInteractive = false;
  
    function isFunction(it) {
      return ostring.call(it) === '[object Function]';
    }
  
    function isArray(it) {
      return ostring.call(it) === '[object Array]';
    }
  
    /**
    * Helper function for iterating over an array. If the func returns
    * a true value, it will break out of the loop.
    */
    function each(ary, func) {
      if (ary) {
        var i;
        for (i = 0; i < ary.length; i += 1) {
          if (ary[i] && func(ary[i], i, ary)) {
            break;
          }
        }
      }
    }
  
    /**
    * Helper function for iterating over an array backwards. If the func
    * returns a true value, it will break out of the loop.
    */
    function eachReverse(ary, func) {
      if (ary) {
        var i;
        for (i = ary.length - 1; i > -1; i -= 1) {
          if (ary[i] && func(ary[i], i, ary)) {
            break;
          }
        }
      }
    }
  
    function hasProp(obj, prop) {
      return hasOwn.call(obj, prop);
    }
  
    function getOwn(obj, prop) {
      return hasProp(obj, prop) && obj[prop];
    }
  
    /**
    * Cycles over properties in an object and calls a function for each
    * property value. If the function returns a truthy value, then the
    * iteration is stopped.
    */
    function eachProp(obj, func) {
      var prop;
      for (prop in obj) {
        if (hasProp(obj, prop)) {
          if (func(obj[prop], prop)) {
            break;
          }
        }
      }
    }
  
    /**
    * Simple function to mix in properties from source into target,
    * but only if target does not already have a property of the same name.
    */
    function mixin(target, source, force, deepStringMixin) {
      if (source) {
        eachProp(source, function (value, prop) {
          if (force || !hasProp(target, prop)) {
            if (deepStringMixin && typeof value !== 'string') {
              if (!target[prop]) {
                target[prop] = {};
              }
              mixin(target[prop], value, force, deepStringMixin);
            } else {
              target[prop] = value;
            }
          }
        });
      }
      return target;
    }
  
    //Similar to Function.prototype.bind, but the 'this' object is specified
    //first, since it is easier to read/figure out what 'this' will be.
    function bind(obj, fn) {
      return function () {
        return fn.apply(obj, arguments);
      };
    }
  
    function scripts() {
      return document.getElementsByTagName('script');
    }
  
    function defaultOnError(err) {
      throw err;
    }
  
    //Allow getting a global that expressed in
    //dot notation, like 'a.b.c'.
    function getGlobal(value) {
      if (!value) {
        return value;
      }
      var g = global;
      each(value.split('.'), function (part) {
        g = g[part];
      });
      return g;
    }
  
    /**
    * Constructs an error with a pointer to an URL with more information.
    * @param {String} id the error ID that maps to an ID on a web page.
    * @param {String} message human readable error.
    * @param {Error} [err] the original error, if there is one.
    *
    * @returns {Error}
    */
    function makeError(id, msg, err, requireModules) {
      var e = new Error(msg + '\nhttp://requirejs.org/docs/errors.html#' + id);
      e.requireType = id;
      e.requireModules = requireModules;
      if (err) {
        e.originalError = err;
      }
      return e;
    }
  
    if (typeof define !== 'undefined') {
      //If a define is already in play via another AMD loader,
      //do not overwrite.
      return;
    }
  
    if (typeof requirejs !== 'undefined') {
      if (isFunction(requirejs)) {
        //Do not overwrite and existing requirejs instance.
        return;
      }
      cfg = requirejs;
      requirejs = undefined;
    }
  
    //Allow for a require config object
    if (typeof require !== 'undefined' && !isFunction(require)) {
      //assume it is a config object.
      cfg = require;
      require = undefined;
    }
  
    function newContext(contextName) {
      var inCheckLoaded, Module, context, handlers,
              checkLoadedTimeoutId,
              config = {
                //Defaults. Do not set a default for map
                //config to speed up normalize(), which
                //will run faster if there is no default.
                waitSeconds: 7,
                baseUrl: './',
                paths: {},
                pkgs: {},
                shim: {},
                config: {}
              },
              registry = {},
      //registry of just enabled modules, to speed
      //cycle breaking code when lots of modules
      //are registered, but not activated.
              enabledRegistry = {},
              undefEvents = {},
              defQueue = [],
              defined = {},
              urlFetched = {},
              requireCounter = 1,
              unnormalizedCounter = 1;
  
      /**
      * Trims the . and .. from an array of path segments.
      * It will keep a leading path segment if a .. will become
      * the first path segment, to help with module name lookups,
      * which act like paths, but can be remapped. But the end result,
      * all paths that use this function should look normalized.
      * NOTE: this method MODIFIES the input array.
      * @param {Array} ary the array of path segments.
      */
      function trimDots(ary) {
        var i, part;
        for (i = 0; ary[i]; i += 1) {
          part = ary[i];
          if (part === '.') {
            ary.splice(i, 1);
            i -= 1;
          } else if (part === '..') {
            if (i === 1 && (ary[2] === '..' || ary[0] === '..')) {
              //End of the line. Keep at least one non-dot
              //path segment at the front so it can be mapped
              //correctly to disk. Otherwise, there is likely
              //no path mapping for a path starting with '..'.
              //This can still fail, but catches the most reasonable
              //uses of ..
              break;
            } else if (i > 0) {
              ary.splice(i - 1, 2);
              i -= 2;
            }
          }
        }
      }
  
      /**
      * Given a relative module name, like ./something, normalize it to
      * a real name that can be mapped to a path.
      * @param {String} name the relative name
      * @param {String} baseName a real name that the name arg is relative
      * to.
      * @param {Boolean} applyMap apply the map config to the value. Should
      * only be done if this normalization is for a dependency ID.
      * @returns {String} normalized name
      */
      function normalize(name, baseName, applyMap) {
        var pkgName, pkgConfig, mapValue, nameParts, i, j, nameSegment,
                  foundMap, foundI, foundStarMap, starI,
                  baseParts = baseName && baseName.split('/'),
                  normalizedBaseParts = baseParts,
                  map = config.map,
                  starMap = map && map['*'];
  
        //Adjust any relative paths.
        if (name && name.charAt(0) === '.') {
          //If have a base name, try to normalize against it,
          //otherwise, assume it is a top-level require that will
          //be relative to baseUrl in the end.
          if (baseName) {
            if (getOwn(config.pkgs, baseName)) {
              //If the baseName is a package name, then just treat it as one
              //name to concat the name with.
              normalizedBaseParts = baseParts = [baseName];
            } else {
              //Convert baseName to array, and lop off the last part,
              //so that . matches that 'directory' and not name of the baseName's
              //module. For instance, baseName of 'one/two/three', maps to
              //'one/two/three.js', but we want the directory, 'one/two' for
              //this normalization.
              normalizedBaseParts = baseParts.slice(0, baseParts.length - 1);
            }
  
            name = normalizedBaseParts.concat(name.split('/'));
            trimDots(name);
  
            //Some use of packages may use a . path to reference the
            //'main' module name, so normalize for that.
            pkgConfig = getOwn(config.pkgs, (pkgName = name[0]));
            name = name.join('/');
            if (pkgConfig && name === pkgName + '/' + pkgConfig.main) {
              name = pkgName;
            }
          } else if (name.indexOf('./') === 0) {
            // No baseName, so this is ID is resolved relative
            // to baseUrl, pull off the leading dot.
            name = name.substring(2);
          }
        }
  
        //Apply map config if available.
        if (applyMap && map && (baseParts || starMap)) {
          nameParts = name.split('/');
  
          for (i = nameParts.length; i > 0; i -= 1) {
            nameSegment = nameParts.slice(0, i).join('/');
  
            if (baseParts) {
              //Find the longest baseName segment match in the config.
              //So, do joins on the biggest to smallest lengths of baseParts.
              for (j = baseParts.length; j > 0; j -= 1) {
                mapValue = getOwn(map, baseParts.slice(0, j).join('/'));
  
                //baseName segment has config, find if it has one for
                //this name.
                if (mapValue) {
                  mapValue = getOwn(mapValue, nameSegment);
                  if (mapValue) {
                    //Match, update name to the new value.
                    foundMap = mapValue;
                    foundI = i;
                    break;
                  }
                }
              }
            }
  
            if (foundMap) {
              break;
            }
  
            //Check for a star map match, but just hold on to it,
            //if there is a shorter segment match later in a matching
            //config, then favor over this star map.
            if (!foundStarMap && starMap && getOwn(starMap, nameSegment)) {
              foundStarMap = getOwn(starMap, nameSegment);
              starI = i;
            }
          }
  
          if (!foundMap && foundStarMap) {
            foundMap = foundStarMap;
            foundI = starI;
          }
  
          if (foundMap) {
            nameParts.splice(0, foundI, foundMap);
            name = nameParts.join('/');
          }
        }
  
        return name;
      }
  
      function removeScript(name) {
        if (isBrowser) {
          each(scripts(), function (scriptNode) {
            if (scriptNode.getAttribute('data-requiremodule') === name &&
                              scriptNode.getAttribute('data-requirecontext') === context.contextName) {
              scriptNode.parentNode.removeChild(scriptNode);
              return true;
            }
          });
        }
      }
  
      function hasPathFallback(id) {
        var pathConfig = getOwn(config.paths, id);
        if (pathConfig && isArray(pathConfig) && pathConfig.length > 1) {
          //Pop off the first array value, since it failed, and
          //retry
          pathConfig.shift();
          context.require.undef(id);
          context.require([id]);
          return true;
        }
      }
  
      //Turns a plugin!resource to [plugin, resource]
      //with the plugin being undefined if the name
      //did not have a plugin prefix.
      function splitPrefix(name) {
        var prefix,
                  index = name ? name.indexOf('!') : -1;
        if (index > -1) {
          prefix = name.substring(0, index);
          name = name.substring(index + 1, name.length);
        }
        return [prefix, name];
      }
  
      /**
      * Creates a module mapping that includes plugin prefix, module
      * name, and path. If parentModuleMap is provided it will
      * also normalize the name via require.normalize()
      *
      * @param {String} name the module name
      * @param {String} [parentModuleMap] parent module map
      * for the module name, used to resolve relative names.
      * @param {Boolean} isNormalized: is the ID already normalized.
      * This is true if this call is done for a define() module ID.
      * @param {Boolean} applyMap: apply the map config to the ID.
      * Should only be true if this map is for a dependency.
      *
      * @returns {Object}
      */
      function makeModuleMap(name, parentModuleMap, isNormalized, applyMap) {
        var url, pluginModule, suffix, nameParts,
              prefix = null,
              parentName = parentModuleMap ? parentModuleMap.name : null,
              originalName = name,
              isDefine = true,
              normalizedName = '';
  
        //If no name, then it means it is a require call, generate an
        //internal name.
        if (!name) {
          isDefine = false;
          name = '_@r' + (requireCounter += 1);
        }
  
        nameParts = splitPrefix(name);
        prefix = nameParts[0];
        name = nameParts[1];
  
        if (prefix) {
          prefix = normalize(prefix, parentName, applyMap);
          pluginModule = getOwn(defined, prefix);
        }
  
        //Account for relative paths if there is a base name.
        if (name) {
          if (prefix) {
            if (pluginModule && pluginModule.normalize) {
              //Plugin is loaded, use its normalize method.
              normalizedName = pluginModule.normalize(name, function (name) {
                return normalize(name, parentName, applyMap);
              });
            } else {
              normalizedName = normalize(name, parentName, applyMap);
            }
          } else {
            //A regular module.
            normalizedName = normalize(name, parentName, applyMap);
  
            //Normalized name may be a plugin ID due to map config
            //application in normalize. The map config values must
            //already be normalized, so do not need to redo that part.
            nameParts = splitPrefix(normalizedName);
            prefix = nameParts[0];
            normalizedName = nameParts[1];
            isNormalized = true;
  
            url = context.nameToUrl(normalizedName);
          }
        }
  
        //If the id is a plugin id that cannot be determined if it needs
        //normalization, stamp it with a unique ID so two matching relative
        //ids that may conflict can be separate.
        suffix = prefix && !pluginModule && !isNormalized ?
                    '_unnormalized' + (unnormalizedCounter += 1) :
                    '';
  
        return {
          prefix: prefix,
          name: normalizedName,
          parentMap: parentModuleMap,
          unnormalized: !!suffix,
          url: url,
          originalName: originalName,
          isDefine: isDefine,
          id: (prefix ?
                      prefix + '!' + normalizedName :
                      normalizedName) + suffix
        };
      }
  
      function getModule(depMap) {
        var id = depMap.id,
              mod = getOwn(registry, id);
  
        if (!mod) {
          mod = registry[id] = new context.Module(depMap);
        }
  
        return mod;
      }
  
      function on(depMap, name, fn) {
        var id = depMap.id,
                  mod = getOwn(registry, id);
  
        if (hasProp(defined, id) &&
                      (!mod || mod.defineEmitComplete)) {
          if (name === 'defined') {
            fn(defined[id]);
          }
        } else {
          mod = getModule(depMap);
          if (mod.error && name === 'error') {
            fn(mod.error);
          } else {
            mod.on(name, fn);
          }
        }
      }
  
      function onError(err, errback) {
        var ids = err.requireModules,
                  notified = false;
  
        if (errback) {
          errback(err);
        } else {
          each(ids, function (id) {
            var mod = getOwn(registry, id);
            if (mod) {
              //Set error on module, so it skips timeout checks.
              mod.error = err;
              if (mod.events.error) {
                notified = true;
                mod.emit('error', err);
              }
            }
          });
  
          if (!notified) {
            req.onError(err);
          }
        }
      }
  
  /**
  * Internal method to transfer globalQueue items to this context's
  * defQueue.
  */
  function takeGlobalQueue() {
    //Push all the globalDefQueue items into the context's defQueue
    if (globalDefQueue.length) {
      //Array splice in the values since the context code has a
      //local var ref to defQueue, so cannot just reassign the one
      //on context.
      apsp.apply(defQueue,
                          [defQueue.length - 1, 0].concat(globalDefQueue));
      globalDefQueue = [];
    }
  }
  
      handlers = {
        'require': function (mod) {
          if (mod.require) {
            return mod.require;
          } else {
            return (mod.require = context.makeRequire(mod.map));
          }
        },
        'exports': function (mod) {
          mod.usingExports = true;
          if (mod.map.isDefine) {
            if (mod.exports) {
              return mod.exports;
            } else {
              return (mod.exports = defined[mod.map.id] = {});
            }
          }
        },
        'module': function (mod) {
          if (mod.module) {
            return mod.module;
          } else {
            return (mod.module = {
              id: mod.map.id,
              uri: mod.map.url,
              config: function () {
                var c,
                                  pkg = getOwn(config.pkgs, mod.map.id);
                // For packages, only support config targeted
                // at the main module.
                c = pkg ? getOwn(config.config, mod.map.id + '/' + pkg.main) :
                                        getOwn(config.config, mod.map.id);
                return c || {};
              },
              exports: defined[mod.map.id]
            });
          }
        }
      };
  
      function cleanRegistry(id) {
        //Clean up machinery used for waiting modules.
        delete registry[id];
        delete enabledRegistry[id];
      }
  
      function breakCycle(mod, traced, processed) {
        var id = mod.map.id;
  
        if (mod.error) {
          mod.emit('error', mod.error);
        } else {
          traced[id] = true;
          each(mod.depMaps, function (depMap, i) {
            var depId = depMap.id,
                          dep = getOwn(registry, depId);
  
            //Only force things that have not completed
            //being defined, so still in the registry,
            //and only if it has not been matched up
            //in the module already.
            if (dep && !mod.depMatched[i] && !processed[depId]) {
              if (getOwn(traced, depId)) {
                mod.defineDep(i, defined[depId]);
                mod.check(); //pass false?
              } else {
                breakCycle(dep, traced, processed);
              }
            }
          });
          processed[id] = true;
        }
      }
  
      function checkLoaded() {
        var map, modId, err, usingPathFallback,
                  waitInterval = config.waitSeconds * 1000,
        //It is possible to disable the wait interval by using waitSeconds of 0.
                  expired = waitInterval && (context.startTime + waitInterval) < new Date().getTime(),
                  noLoads = [],
                  reqCalls = [],
                  stillLoading = false,
                  needCycleCheck = true;
  
        //Do not bother if this call was a result of a cycle break.
        if (inCheckLoaded) {
          return;
        }
  
        inCheckLoaded = true;
  
        //Figure out the state of all the modules.
        eachProp(enabledRegistry, function (mod) {
          map = mod.map;
          modId = map.id;
  
          //Skip things that are not enabled or in error state.
          if (!mod.enabled) {
            return;
          }
  
          if (!map.isDefine) {
            reqCalls.push(mod);
          }
  
          if (!mod.error) {
            //If the module should be executed, and it has not
            //been inited and time is up, remember it.
            if (!mod.inited && expired) {
              if (hasPathFallback(modId)) {
                usingPathFallback = true;
                stillLoading = true;
              } else {
                noLoads.push(modId);
                removeScript(modId);
              }
            } else if (!mod.inited && mod.fetched && map.isDefine) {
              stillLoading = true;
              if (!map.prefix) {
                //No reason to keep looking for unfinished
                //loading. If the only stillLoading is a
                //plugin resource though, keep going,
                //because it may be that a plugin resource
                //is waiting on a non-plugin cycle.
                return (needCycleCheck = false);
              }
            }
          }
        });
  
        if (expired && noLoads.length) {
          //If wait time expired, throw error of unloaded modules.
          err = makeError('timeout', 'Load timeout for modules: ' + noLoads, null, noLoads);
          err.contextName = context.contextName;
          return onError(err);
        }
  
        //Not expired, check for a cycle.
        if (needCycleCheck) {
          each(reqCalls, function (mod) {
            breakCycle(mod, {}, {});
          });
        }
  
        //If still waiting on loads, and the waiting load is something
        //other than a plugin resource, or there are still outstanding
        //scripts, then just try back later.
        if ((!expired || usingPathFallback) && stillLoading) {
          //Something is still waiting to load. Wait for it, but only
          //if a timeout is not already in effect.
          if ((isBrowser || isWebWorker) && !checkLoadedTimeoutId) {
            checkLoadedTimeoutId = setTimeout(function () {
              checkLoadedTimeoutId = 0;
              checkLoaded();
            }, 50);
          }
        }
  
        inCheckLoaded = false;
      }
  
      Module = function (map) {
        this.events = getOwn(undefEvents, map.id) || {};
        this.map = map;
        this.shim = getOwn(config.shim, map.id);
        this.depExports = [];
        this.depMaps = [];
        this.depMatched = [];
        this.pluginMaps = {};
        this.depCount = 0;
  
        /* this.exports this.factory
        this.depMaps = [],
        this.enabled, this.fetched
        */
      };
  
      Module.prototype = {
        init: function (depMaps, factory, errback, options) {
          options = options || {};
  
          //Do not do more inits if already done. Can happen if there
          //are multiple define calls for the same module. That is not
          //a normal, common case, but it is also not unexpected.
          if (this.inited) {
            return;
          }
  
          this.factory = factory;
  
          if (errback) {
            //Register for errors on this module.
            this.on('error', errback);
          } else if (this.events.error) {
            //If no errback already, but there are error listeners
            //on this module, set up an errback to pass to the deps.
            errback = bind(this, function (err) {
              this.emit('error', err);
            });
          }
  
          //Do a copy of the dependency array, so that
          //source inputs are not modified. For example
          //"shim" deps are passed in here directly, and
          //doing a direct modification of the depMaps array
          //would affect that config.
          this.depMaps = depMaps && depMaps.slice(0);
  
          this.errback = errback;
  
          //Indicate this module has be initialized
          this.inited = true;
  
          this.ignore = options.ignore;
  
          //Could have option to init this module in enabled mode,
          //or could have been previously marked as enabled. However,
          //the dependencies are not known until init is called. So
          //if enabled previously, now trigger dependencies as enabled.
          if (options.enabled || this.enabled) {
            //Enable this module and dependencies.
            //Will call this.check()
            this.enable();
          } else {
            this.check();
          }
        },
  
        defineDep: function (i, depExports) {
          //Because of cycles, defined callback for a given
          //export can be called more than once.
          if (!this.depMatched[i]) {
            this.depMatched[i] = true;
            this.depCount -= 1;
            this.depExports[i] = depExports;
          }
        },
  
        fetch: function () {
          if (this.fetched) {
            return;
          }
          this.fetched = true;
  
          context.startTime = (new Date()).getTime();
  
          var map = this.map;
  
          //If the manager is for a plugin managed resource,
          //ask the plugin to load it now.
          if (this.shim) {
            context.makeRequire(this.map, {
              enableBuildCallback: true
            })(this.shim.deps || [], bind(this, function () {
              return map.prefix ? this.callPlugin() : this.load();
            }));
          } else {
            //Regular dependency.
            return map.prefix ? this.callPlugin() : this.load();
          }
        },
  
        load: function () {
          var url = this.map.url;
  
          //Regular dependency.
          if (!urlFetched[url]) {
            urlFetched[url] = true;
            context.load(this.map.id, url);
          }
        },
  
        /**
        * Checks if the module is ready to define itself, and if so,
        * define it.
        */
        check: function () {
          if (!this.enabled || this.enabling) {
            return;
          }
  
          var err, cjsModule,
                id = this.map.id,
                depExports = this.depExports,
                exports = this.exports,
                factory = this.factory;
  
          if (!this.inited) {
            this.fetch();
          } else if (this.error) {
            this.emit('error', this.error);
          } else if (!this.defining) {
            //The factory could trigger another require call
            //that would result in checking this module to
            //define itself again. If already in the process
            //of doing that, skip this work.
            this.defining = true;
  
            if (this.depCount < 1 && !this.defined) {
              if (isFunction(factory)) {
                //If there is an error listener, favor passing
                //to that instead of throwing an error. However,
                //only do it for define()'d  modules. require
                //errbacks should not be called for failures in
                //their callbacks (#699). However if a global
                //onError is set, use that.
                if ((this.events.error && this.map.isDefine) ||
                            req.onError !== defaultOnError) {
                  try {
                    exports = context.execCb(id, factory, depExports, exports);
                  } catch (e) {
                    err = e;
                  }
                } else {
                  exports = context.execCb(id, factory, depExports, exports);
                }
  
                if (this.map.isDefine) {
                  //If setting exports via 'module' is in play,
                  //favor that over return value and exports. After that,
                  //favor a non-undefined return value over exports use.
                  cjsModule = this.module;
                  if (cjsModule &&
                                    cjsModule.exports !== undefined &&
                  //Make sure it is not already the exports value
                                    cjsModule.exports !== this.exports) {
                    exports = cjsModule.exports;
                  } else if (exports === undefined && this.usingExports) {
                    //exports already set the defined value.
                    exports = this.exports;
                  }
                }
  
                if (err) {
                  err.requireMap = this.map;
                  err.requireModules = this.map.isDefine ? [this.map.id] : null;
                  err.requireType = this.map.isDefine ? 'define' : 'require';
                  return onError((this.error = err));
                }
  
              } else {
                //Just a literal value
                exports = factory;
              }
  
              this.exports = exports;
  
              if (this.map.isDefine && !this.ignore) {
                defined[id] = exports;
  
                if (req.onResourceLoad) {
                  req.onResourceLoad(context, this.map, this.depMaps);
                }
              }
  
              //Clean up
              cleanRegistry(id);
  
              this.defined = true;
            }
  
            //Finished the define stage. Allow calling check again
            //to allow define notifications below in the case of a
            //cycle.
            this.defining = false;
  
            if (this.defined && !this.defineEmitted) {
              this.defineEmitted = true;
              this.emit('defined', this.exports);
              this.defineEmitComplete = true;
            }
  
          }
        },
  
        callPlugin: function () {
          var map = this.map,
                  id = map.id,
          //Map already normalized the prefix.
                  pluginMap = makeModuleMap(map.prefix);
  
          //Mark this as a dependency for this plugin, so it
          //can be traced for cycles.
          this.depMaps.push(pluginMap);
  
          on(pluginMap, 'defined', bind(this, function (plugin) {
            var load, normalizedMap, normalizedMod,
                      name = this.map.name,
                      parentName = this.map.parentMap ? this.map.parentMap.name : null,
                      localRequire = context.makeRequire(map.parentMap, {
                        enableBuildCallback: true
                      });
  
            //If current map is not normalized, wait for that
            //normalized name to load instead of continuing.
            if (this.map.unnormalized) {
              //Normalize the ID if the plugin allows it.
              if (plugin.normalize) {
                name = plugin.normalize(name, function (name) {
                  return normalize(name, parentName, true);
                }) || '';
              }
  
              //prefix and name should already be normalized, no need
              //for applying map config again either.
              normalizedMap = makeModuleMap(map.prefix + '!' + name,
                                                    this.map.parentMap);
              on(normalizedMap,
                          'defined', bind(this, function (value) {
                            this.init([], function () { return value; }, null, {
                              enabled: true,
                              ignore: true
                            });
                          }));
  
              normalizedMod = getOwn(registry, normalizedMap.id);
              if (normalizedMod) {
                //Mark this as a dependency for this plugin, so it
                //can be traced for cycles.
                this.depMaps.push(normalizedMap);
  
                if (this.events.error) {
                  normalizedMod.on('error', bind(this, function (err) {
                    this.emit('error', err);
                  }));
                }
                normalizedMod.enable();
              }
  
              return;
            }
  
            load = bind(this, function (value) {
              this.init([], function () { return value; }, null, {
                enabled: true
              });
            });
  
            load.error = bind(this, function (err) {
              this.inited = true;
              this.error = err;
              err.requireModules = [id];
  
              //Remove temp unnormalized modules for this module,
              //since they will never be resolved otherwise now.
              eachProp(registry, function (mod) {
                if (mod.map.id.indexOf(id + '_unnormalized') === 0) {
                  cleanRegistry(mod.map.id);
                }
              });
  
              onError(err);
            });
  
            //Allow plugins to load other code without having to know the
            //context or how to 'complete' the load.
            load.fromText = bind(this, function (text, textAlt) {
              /*jslint evil: true */
              var moduleName = map.name,
                          moduleMap = makeModuleMap(moduleName),
                          hasInteractive = useInteractive;
  
              //As of 2.1.0, support just passing the text, to reinforce
              //fromText only being called once per resource. Still
              //support old style of passing moduleName but discard
              //that moduleName in favor of the internal ref.
              if (textAlt) {
                text = textAlt;
              }
  
              //Turn off interactive script matching for IE for any define
              //calls in the text, then turn it back on at the end.
              if (hasInteractive) {
                useInteractive = false;
              }
  
              //Prime the system by creating a module instance for
              //it.
              getModule(moduleMap);
  
              //Transfer any config to this other module.
              if (hasProp(config.config, id)) {
                config.config[moduleName] = config.config[id];
              }
  
              try {
                req.exec(text);
              } catch (e) {
                return onError(makeError('fromtexteval',
                                            'fromText eval for ' + id +
                                          ' failed: ' + e,
                                            e,
                                            [id]));
              }
  
              if (hasInteractive) {
                useInteractive = true;
              }
  
              //Mark this as a dependency for the plugin
              //resource
              this.depMaps.push(moduleMap);
  
              //Support anonymous modules.
              context.completeLoad(moduleName);
  
              //Bind the value of that module to the value for this
              //resource ID.
              localRequire([moduleName], load);
            });
  
            //Use parentName here since the plugin's name is not reliable,
            //could be some weird string with no path that actually wants to
            //reference the parentName's path.
            plugin.load(map.name, localRequire, load, config);
          }));
  
          context.enable(pluginMap, this);
          this.pluginMaps[pluginMap.id] = pluginMap;
        },
  
        enable: function () {
          enabledRegistry[this.map.id] = this;
          this.enabled = true;
  
          //Set flag mentioning that the module is enabling,
          //so that immediate calls to the defined callbacks
          //for dependencies do not trigger inadvertent load
          //with the depCount still being zero.
          this.enabling = true;
  
          //Enable each dependency
          each(this.depMaps, bind(this, function (depMap, i) {
            var id, mod, handler;
  
            if (typeof depMap === 'string') {
              //Dependency needs to be converted to a depMap
              //and wired up to this module.
              depMap = makeModuleMap(depMap,
                                            (this.map.isDefine ? this.map : this.map.parentMap),
                                            false,
                                            !this.skipMap);
              this.depMaps[i] = depMap;
  
              handler = getOwn(handlers, depMap.id);
  
              if (handler) {
                this.depExports[i] = handler(this);
                return;
              }
  
              this.depCount += 1;
  
              on(depMap, 'defined', bind(this, function (depExports) {
                this.defineDep(i, depExports);
                this.check();
              }));
  
              if (this.errback) {
                on(depMap, 'error', bind(this, this.errback));
              }
            }
  
            id = depMap.id;
            mod = registry[id];
  
            //Skip special modules like 'require', 'exports', 'module'
            //Also, don't call enable if it is already enabled,
            //important in circular dependency cases.
            if (!hasProp(handlers, id) && mod && !mod.enabled) {
              context.enable(depMap, this);
            }
          }));
  
          //Enable each plugin that is used in
          //a dependency
          eachProp(this.pluginMaps, bind(this, function (pluginMap) {
            var mod = getOwn(registry, pluginMap.id);
            if (mod && !mod.enabled) {
              context.enable(pluginMap, this);
            }
          }));
  
          this.enabling = false;
  
          this.check();
        },
  
        on: function (name, cb) {
          var cbs = this.events[name];
          if (!cbs) {
            cbs = this.events[name] = [];
          }
          cbs.push(cb);
        },
  
        emit: function (name, evt) {
          each(this.events[name], function (cb) {
            cb(evt);
          });
          if (name === 'error') {
            //Now that the error handler was triggered, remove
            //the listeners, since this broken Module instance
            //can stay around for a while in the registry.
            delete this.events[name];
          }
        }
      };
  
      function callGetModule(args) {
        //Skip modules already defined.
        if (!hasProp(defined, args[0])) {
          getModule(makeModuleMap(args[0], null, true)).init(args[1], args[2]);
        }
      }
  
      function removeListener(node, func, name, ieName) {
        //Favor detachEvent because of IE9
        //issue, see attachEvent/addEventListener comment elsewhere
        //in this file.
        if (node.detachEvent && !isOpera) {
          //Probably IE. If not it will throw an error, which will be
          //useful to know.
          if (ieName) {
            node.detachEvent(ieName, func);
          }
        } else {
          node.removeEventListener(name, func, false);
        }
      }
  
      /**
      * Given an event from a script node, get the requirejs info from it,
      * and then removes the event listeners on the node.
      * @param {Event} evt
      * @returns {Object}
      */
      function getScriptData(evt) {
        //Using currentTarget instead of target for Firefox 2.0's sake. Not
        //all old browsers will be supported, but this one was easy enough
        //to support and still makes sense.
        var node = evt.currentTarget || evt.srcElement;
  
        //Remove the listeners once here.
        removeListener(node, context.onScriptLoad, 'load', 'onreadystatechange');
        removeListener(node, context.onScriptError, 'error');
  
        return {
          node: node,
          id: node && node.getAttribute('data-requiremodule')
        };
      }
  
  function intakeDefines() {
    var args;
  
    //Any defined modules in the global queue, intake them now.
    takeGlobalQueue();
  
    //Make sure any remaining defQueue items get properly processed.
    while (defQueue.length) {
      args = defQueue.shift();
      if (args[0] === null) {
        return onError(makeError('mismatch', 'Mismatched anonymous define() module: ' + args[args.length - 1]));
      } else {
        //args are id, deps, factory. Should be normalized by the
        //define() function.
        callGetModule(args);
      }
    }
  }
  
      context = {
        config: config,
        contextName: contextName,
        registry: registry,
        defined: defined,
        urlFetched: urlFetched,
        defQueue: defQueue,
        Module: Module,
        makeModuleMap: makeModuleMap,
        nextTick: req.nextTick,
        onError: onError,
  
        /**
        * Set a configuration for the context.
        * @param {Object} cfg config object to integrate.
        */
        configure: function (cfg) {
          //Make sure the baseUrl ends in a slash.
          if (cfg.baseUrl) {
            if (cfg.baseUrl.charAt(cfg.baseUrl.length - 1) !== '/') {
              cfg.baseUrl += '/';
            }
          }
  
          //Save off the paths and packages since they require special processing,
          //they are additive.
          var pkgs = config.pkgs,
                shim = config.shim,
                objs = {
                  paths: true,
                  config: true,
                  map: true
                };
  
          eachProp(cfg, function (value, prop) {
            if (objs[prop]) {
              if (prop === 'map') {
                if (!config.map) {
                  config.map = {};
                }
                mixin(config[prop], value, true, true);
              } else {
                mixin(config[prop], value, true);
              }
            } else {
              config[prop] = value;
            }
          });
  
          //Merge shim
          if (cfg.shim) {
            eachProp(cfg.shim, function (value, id) {
              //Normalize the structure
              if (isArray(value)) {
                value = {
                  deps: value
                };
              }
              if ((value.exports || value.init) && !value.exportsFn) {
                value.exportsFn = context.makeShimExports(value);
              }
              shim[id] = value;
            });
            config.shim = shim;
          }
  
          //Adjust packages if necessary.
          if (cfg.packages) {
            each(cfg.packages, function (pkgObj) {
              var location;
  
              pkgObj = typeof pkgObj === 'string' ? { name: pkgObj} : pkgObj;
              location = pkgObj.location;
  
              //Create a brand new object on pkgs, since currentPackages can
              //be passed in again, and config.pkgs is the internal transformed
              //state for all package configs.
              pkgs[pkgObj.name] = {
                name: pkgObj.name,
                location: location || pkgObj.name,
                //Remove leading dot in main, so main paths are normalized,
                //and remove any trailing .js, since different package
                //envs have different conventions: some use a module name,
                //some use a file name.
                main: (pkgObj.main || 'main')
                              .replace(currDirRegExp, '')
                              .replace(jsSuffixRegExp, '')
              };
            });
  
            //Done with modifications, assing packages back to context config
            config.pkgs = pkgs;
          }
  
          //If there are any "waiting to execute" modules in the registry,
          //update the maps for them, since their info, like URLs to load,
          //may have changed.
          eachProp(registry, function (mod, id) {
            //If module already has init called, since it is too
            //late to modify them, and ignore unnormalized ones
            //since they are transient.
            if (!mod.inited && !mod.map.unnormalized) {
              mod.map = makeModuleMap(id);
            }
          });
  
          //If a deps array or a config callback is specified, then call
          //require with those args. This is useful when require is defined as a
          //config object before require.js is loaded.
          if (cfg.deps || cfg.callback) {
            context.require(cfg.deps || [], cfg.callback);
          }
        },
  
        makeShimExports: function (value) {
          function fn() {
            var ret;
            if (value.init) {
              ret = value.init.apply(global, arguments);
            }
            return ret || (value.exports && getGlobal(value.exports));
          }
          return fn;
        },
  
        makeRequire: function (relMap, options) {
          options = options || {};
  
          function localRequire(deps, callback, errback) {
            var id, map, requireMod;
  
            if (options.enableBuildCallback && callback && isFunction(callback)) {
              callback.__requireJsBuild = true;
            }
  
            if (typeof deps === 'string') {
              if (isFunction(callback)) {
                //Invalid call
                return onError(makeError('requireargs', 'Invalid require call'), errback);
              }
  
              //If require|exports|module are requested, get the
              //value for them from the special handlers. Caveat:
              //this only works while module is being defined.
              if (relMap && hasProp(handlers, deps)) {
                return handlers[deps](registry[relMap.id]);
              }
  
              //Synchronous access to one module. If require.get is
              //available (as in the Node adapter), prefer that.
              if (req.get) {
                return req.get(context, deps, relMap, localRequire);
              }
  
              //Normalize module name, if it contains . or ..
              map = makeModuleMap(deps, relMap, false, true);
              id = map.id;
  
              if (!hasProp(defined, id)) {
                return onError(makeError('notloaded', 'Module name "' +
                                  id +
                                  '" has not been loaded yet for context: ' +
                                  contextName +
                                  (relMap ? '' : '. Use require([])')));
              }
              return defined[id];
            }
  
            //Grab defines waiting in the global queue.
            intakeDefines();
  
            //Mark all the dependencies as needing to be loaded.
            context.nextTick(function () {
              //Some defines could have been added since the
              //require call, collect them.
              intakeDefines();
  
              requireMod = getModule(makeModuleMap(null, relMap));
  
              //Store if map config should be applied to this require
              //call for dependencies.
              requireMod.skipMap = options.skipMap;
  
              requireMod.init(deps, callback, errback, {
                enabled: true
              });
  
              checkLoaded();
            });
  
            return localRequire;
          }
  
          mixin(localRequire, {
            isBrowser: isBrowser,
  
            /**
            * Converts a module name + .extension into an URL path.
            * *Requires* the use of a module name. It does not support using
            * plain URLs like nameToUrl.
            */
            toUrl: function (moduleNamePlusExt) {
              var ext,
                              index = moduleNamePlusExt.lastIndexOf('.'),
                              segment = moduleNamePlusExt.split('/')[0],
                              isRelative = segment === '.' || segment === '..';
  
              //Have a file extension alias, and it is not the
              //dots from a relative path.
              if (index !== -1 && (!isRelative || index > 1)) {
                ext = moduleNamePlusExt.substring(index, moduleNamePlusExt.length);
                moduleNamePlusExt = moduleNamePlusExt.substring(0, index);
              }
  
              return context.nameToUrl(normalize(moduleNamePlusExt,
                                                  relMap && relMap.id, true), ext, true);
            },
  
            defined: function (id) {
              return hasProp(defined, makeModuleMap(id, relMap, false, true).id);
            },
  
            specified: function (id) {
              id = makeModuleMap(id, relMap, false, true).id;
              return hasProp(defined, id) || hasProp(registry, id);
            }
          });
  
          //Only allow undef on top level require calls
          if (!relMap) {
            localRequire.undef = function (id) {
              //Bind any waiting define() calls to this context,
              //fix for #408
              takeGlobalQueue();
  
              var map = makeModuleMap(id, relMap, true),
                              mod = getOwn(registry, id);
  
              removeScript(id);
  
              delete defined[id];
              delete urlFetched[map.url];
              delete undefEvents[id];
  
              if (mod) {
                //Hold on to listeners in case the
                //module will be attempted to be reloaded
                //using a different config.
                if (mod.events.defined) {
                  undefEvents[id] = mod.events;
                }
  
                cleanRegistry(id);
              }
            };
          }
  
          return localRequire;
        },
  
        /**
        * Called to enable a module if it is still in the registry
        * awaiting enablement. A second arg, parent, the parent module,
        * is passed in for context, when this method is overriden by
        * the optimizer. Not shown here to keep code compact.
        */
        enable: function (depMap) {
          var mod = getOwn(registry, depMap.id);
          if (mod) {
            getModule(depMap).enable();
          }
        },
  
        /**
        * Internal method used by environment adapters to complete a load event.
        * A load event could be a script load or just a load pass from a synchronous
        * load call.
        * @param {String} moduleName the name of the module to potentially complete.
        */
        completeLoad: function (moduleName) {
          var found, args, mod,
                      shim = getOwn(config.shim, moduleName) || {},
                      shExports = shim.exports;
  
          takeGlobalQueue();
  
          while (defQueue.length) {
            args = defQueue.shift();
            if (args[0] === null) {
              args[0] = moduleName;
              //If already found an anonymous module and bound it
              //to this name, then this is some other anon module
              //waiting for its completeLoad to fire.
              if (found) {
                break;
              }
              found = true;
            } else if (args[0] === moduleName) {
              //Found matching define call for this script!
              found = true;
            }
  
            callGetModule(args);
          }
  
          //Do this after the cycle of callGetModule in case the result
          //of those calls/init calls changes the registry.
          mod = getOwn(registry, moduleName);
  
          if (!found && !hasProp(defined, moduleName) && mod && !mod.inited) {
            if (config.enforceDefine && (!shExports || !getGlobal(shExports))) {
              if (hasPathFallback(moduleName)) {
                return;
              } else {
                return onError(makeError('nodefine',
                                               'No define call for ' + moduleName,
                                               null,
                                               [moduleName]));
              }
            } else {
              //A script that does not call define(), so just simulate
              //the call for it.
              callGetModule([moduleName, (shim.deps || []), shim.exportsFn]);
            }
          }
  
          checkLoaded();
        },
  
        /**
        * Converts a module name to a file path. Supports cases where
        * moduleName may actually be just an URL.
        * Note that it **does not** call normalize on the moduleName,
        * it is assumed to have already been normalized. This is an
        * internal API, not a public one. Use toUrl for the public API.
        */
        nameToUrl: function (moduleName, ext, skipExt) {
          var paths, pkgs, pkg, pkgPath, syms, i, parentModule, url,
                      parentPath;
  
          //If a colon is in the URL, it indicates a protocol is used and it is just
          //an URL to a file, or if it starts with a slash, contains a query arg (i.e. ?)
          //or ends with .js, then assume the user meant to use an url and not a module id.
          //The slash is important for protocol-less URLs as well as full paths.
          if (req.jsExtRegExp.test(moduleName)) {
            //Just a plain path, not module name lookup, so just return it.
            //Add extension if it is included. This is a bit wonky, only non-.js things pass
            //an extension, this method probably needs to be reworked.
            url = moduleName + (ext || '');
          } else {
            //A module that needs to be converted to a path.
            paths = config.paths;
            pkgs = config.pkgs;
  
            syms = moduleName.split('/');
            //For each module name segment, see if there is a path
            //registered for it. Start with most specific name
            //and work up from it.
            for (i = syms.length; i > 0; i -= 1) {
              parentModule = syms.slice(0, i).join('/');
              pkg = getOwn(pkgs, parentModule);
              parentPath = getOwn(paths, parentModule);
              if (parentPath) {
                //If an array, it means there are a few choices,
                //Choose the one that is desired
                if (isArray(parentPath)) {
                  parentPath = parentPath[0];
                }
                syms.splice(0, i, parentPath);
                break;
              } else if (pkg) {
                //If module name is just the package name, then looking
                //for the main module.
                if (moduleName === pkg.name) {
                  pkgPath = pkg.location + '/' + pkg.main;
                } else {
                  pkgPath = pkg.location;
                }
                syms.splice(0, i, pkgPath);
                break;
              }
            }
  
            //Join the path parts together, then figure out if baseUrl is needed.
            url = syms.join('/');
            url += (ext || (/^data\:|\?/.test(url) || skipExt ? '' : '.js'));
            url = (url.charAt(0) === '/' || url.match(/^[\w\+\.\-]+:/) ? '' : config.baseUrl) + url;
          }
  
          return config.urlArgs ? url +
                                          ((url.indexOf('?') === -1 ? '?' : '&') +
                                           config.urlArgs) : url;
        },
  
        //Delegates to req.load. Broken out as a separate function to
        //allow overriding in the optimizer.
        load: function (id, url) {
          req.load(context, id, url);
        },
  
        /**
        * Executes a module callback function. Broken out as a separate function
        * solely to allow the build system to sequence the files in the built
        * layer in the right sequence.
        *
        * @private
        */
        execCb: function (name, callback, args, exports) {
          return callback.apply(exports, args);
        },
  
        /**
        * callback for script loads, used to check status of loading.
        *
        * @param {Event} evt the event from the browser for the script
        * that was loaded.
        */
        onScriptLoad: function (evt) {
          //Using currentTarget instead of target for Firefox 2.0's sake. Not
          //all old browsers will be supported, but this one was easy enough
          //to support and still makes sense.
          if (evt.type === 'load' ||
                    (readyRegExp.test((evt.currentTarget || evt.srcElement).readyState))) {
            //Reset interactive script so a script node is not held onto for
            //to long.
            interactiveScript = null;
  
            //Pull out the name of the module and the context.
            var data = getScriptData(evt);
            context.completeLoad(data.id);
          }
        },
  
        /**
        * Callback for script errors.
        */
        onScriptError: function (evt) {
          var data = getScriptData(evt);
          if (!hasPathFallback(data.id)) {
            return onError(makeError('scripterror', 'Script error for: ' + data.id, evt, [data.id]));
          }
        }
      };
  
      context.require = context.makeRequire();
      return context;
    }
  
    /**
    * Main entry point.
    *
    * If the only argument to require is a string, then the module that
    * is represented by that string is fetched for the appropriate context.
    *
    * If the first argument is an array, then it will be treated as an array
    * of dependency string names to fetch. An optional function callback can
    * be specified to execute when all of those dependencies are available.
    *
    * Make a local req variable to help Caja compliance (it assumes things
    * on a require that are not standardized), and to give a short
    * name for minification/local scope use.
    */
    req = requirejs = function (deps, callback, errback, optional) {
  
      //Find the right context, use default
      var context, config,
            contextName = defContextName;
  
      // Determine if have config object in the call.
      if (!isArray(deps) && typeof deps !== 'string') {
        // deps is a config object
        config = deps;
        if (isArray(callback)) {
          // Adjust args if there are dependencies
          deps = callback;
          callback = errback;
          errback = optional;
        } else {
          deps = [];
        }
      }
  
      if (config && config.context) {
        contextName = config.context;
      }
  
      context = getOwn(contexts, contextName);
      if (!context) {
        context = contexts[contextName] = req.s.newContext(contextName);
      }
  
      if (config) {
        context.configure(config);
      }
  
      return context.require(deps, callback, errback);
    };
  
    /**
    * Support require.config() to make it easier to cooperate with other
    * AMD loaders on globally agreed names.
    */
    req.config = function (config) {
      return req(config);
    };
  
    /**
    * Execute something after the current tick
    * of the event loop. Override for other envs
    * that have a better solution than setTimeout.
    * @param  {Function} fn function to execute later.
    */
    req.nextTick = typeof setTimeout !== 'undefined' ? function (fn) {
      setTimeout(fn, 4);
    } : function (fn) { fn(); };
  
    /**
    * Export require as a global, but only if it does not already exist.
    */
    if (!require) {
      require = req;
    }
  
    req.version = version;
  
    //Used to filter out dependencies that are already paths.
    req.jsExtRegExp = /^\/|:|\?|\.js$/;
    req.isBrowser = isBrowser;
    s = req.s = {
      contexts: contexts,
      newContext: newContext
    };
  
    //Create default context.
    req({});
  
    //Exports some context-sensitive methods on global require.
    each([
          'toUrl',
          'undef',
          'defined',
          'specified'
      ], function (prop) {
        //Reference from contexts instead of early binding to default context,
        //so that during builds, the latest instance of the default context
        //with its config gets used.
        req[prop] = function () {
          var ctx = contexts[defContextName];
          return ctx.require[prop].apply(ctx, arguments);
        };
      });
  
    if (isBrowser) {
      head = s.head = document.getElementsByTagName('head')[0];
      //If BASE tag is in play, using appendChild is a problem for IE6.
      //When that browser dies, this can be removed. Details in this jQuery bug:
      //http://dev.jquery.com/ticket/2709
      baseElement = document.getElementsByTagName('base')[0];
      if (baseElement) {
        head = s.head = baseElement.parentNode;
      }
    }
  
    /**
    * Any errors that require explicitly generates will be passed to this
    * function. Intercept/override it if you want custom error handling.
    * @param {Error} err the error object.
    */
    req.onError = defaultOnError;
  
    /**
    * Creates the node for the load command. Only used in browser envs.
    */
    req.createNode = function (config, moduleName, url) {
      var node = config.xhtml ?
                document.createElementNS('http://www.w3.org/1999/xhtml', 'html:script') :
                document.createElement('script');
      node.type = config.scriptType || 'text/javascript';
      node.charset = 'utf-8';
      node.async = true;
      return node;
    };
  
    /**
    * Does the request to load a module for the browser case.
    * Make this a separate function to allow other environments
    * to override it.
    *
    * @param {Object} context the require context to find state.
    * @param {String} moduleName the name of the module.
    * @param {Object} url the URL to the module.
    */
    req.load = function (context, moduleName, url) {
      var config = (context && context.config) || {},
            node;
      if (isBrowser) {
        //In the browser so use a script tag
        node = req.createNode(config, moduleName, url);
  
        node.setAttribute('data-requirecontext', context.contextName);
        node.setAttribute('data-requiremodule', moduleName);
  
        //Set up load listener. Test attachEvent first because IE9 has
        //a subtle issue in its addEventListener and script onload firings
        //that do not match the behavior of all other browsers with
        //addEventListener support, which fire the onload event for a
        //script right after the script execution. See:
        //https://connect.microsoft.com/IE/feedback/details/648057/script-onload-event-is-not-fired-immediately-after-script-execution
        //UNFORTUNATELY Opera implements attachEvent but does not follow the script
        //script execution mode.
        if (node.attachEvent &&
        //Check if node.attachEvent is artificially added by custom script or
        //natively supported by browser
        //read https://github.com/jrburke/requirejs/issues/187
        //if we can NOT find [native code] then it must NOT natively supported.
        //in IE8, node.attachEvent does not have toString()
        //Note the test for "[native code" with no closing brace, see:
        //https://github.com/jrburke/requirejs/issues/273
                    !(node.attachEvent.toString && node.attachEvent.toString().indexOf('[native code') < 0) &&
                    !isOpera) {
          //Probably IE. IE (at least 6-8) do not fire
          //script onload right after executing the script, so
          //we cannot tie the anonymous define call to a name.
          //However, IE reports the script as being in 'interactive'
          //readyState at the time of the define call.
          useInteractive = true;
  
          node.attachEvent('onreadystatechange', context.onScriptLoad);
          //It would be great to add an error handler here to catch
          //404s in IE9+. However, onreadystatechange will fire before
          //the error handler, so that does not help. If addEventListener
          //is used, then IE will fire error before load, but we cannot
          //use that pathway given the connect.microsoft.com issue
          //mentioned above about not doing the 'script execute,
          //then fire the script load event listener before execute
          //next script' that other browsers do.
          //Best hope: IE10 fixes the issues,
          //and then destroys all installs of IE 6-9.
          //node.attachEvent('onerror', context.onScriptError);
        } else {
          node.addEventListener('load', context.onScriptLoad, false);
          node.addEventListener('error', context.onScriptError, false);
        }
        node.src = url;
  
        //For some cache cases in IE 6-8, the script executes before the end
        //of the appendChild execution, so to tie an anonymous define
        //call to the module name (which is stored on the node), hold on
        //to a reference to this node, but clear after the DOM insertion.
        currentlyAddingScript = node;
        if (baseElement) {
          head.insertBefore(node, baseElement);
        } else {
          head.appendChild(node);
        }
        currentlyAddingScript = null;
  
        return node;
      } else if (isWebWorker) {
        try {
          //In a web worker, use importScripts. This is not a very
          //efficient use of importScripts, importScripts will block until
          //its script is downloaded and evaluated. However, if web workers
          //are in play, the expectation that a build has been done so that
          //only one script needs to be loaded anyway. This may need to be
          //reevaluated if other use cases become common.
          importScripts(url);
  
          //Account for anonymous modules
          context.completeLoad(moduleName);
        } catch (e) {
          context.onError(makeError('importscripts',
                                'importScripts failed for ' +
                                    moduleName + ' at ' + url,
                                e,
                                [moduleName]));
        }
      }
    };
  
    function getInteractiveScript() {
      if (interactiveScript && interactiveScript.readyState === 'interactive') {
        return interactiveScript;
      }
  
      eachReverse(scripts(), function (script) {
        if (script.readyState === 'interactive') {
          return (interactiveScript = script);
        }
      });
      return interactiveScript;
    }
  
    //Look for a data-main script attribute, which could also adjust the baseUrl.
    if (isBrowser && !cfg.skipDataMain) {
      //Figure out baseUrl. Get it from the script tag with require.js in it.
      eachReverse(scripts(), function (script) {
        //Set the 'head' where we can append children by
        //using the script's parent.
        if (!head) {
          head = script.parentNode;
        }
  
        //Look for a data-main attribute to set main script for the page
        //to load. If it is there, the path to data main becomes the
        //baseUrl, if it is not already set.
        dataMain = script.getAttribute('data-main');
        if (dataMain) {
          //Preserve dataMain in case it is a path (i.e. contains '?')
          mainScript = dataMain;
  
          //Set final baseUrl if there is not already an explicit one.
          if (!cfg.baseUrl) {
            //Pull off the directory of data-main for use as the
            //baseUrl.
            src = mainScript.split('/');
            mainScript = src.pop();
            subPath = src.length ? src.join('/') + '/' : './';
  
            cfg.baseUrl = subPath;
          }
  
          //Strip off any trailing .js since mainScript is now
          //like a module name.
          mainScript = mainScript.replace(jsSuffixRegExp, '');
  
          //If mainScript is still a path, fall back to dataMain
          if (req.jsExtRegExp.test(mainScript)) {
            mainScript = dataMain;
          }
  
          //Put the data-main script in the files to load.
          cfg.deps = cfg.deps ? cfg.deps.concat(mainScript) : [mainScript];
  
          return true;
        }
      });
    }
  
  /**
  * The function that handles definitions of modules. Differs from
  * require() in that a string for the module should be the first argument,
  * and the function to execute after dependencies are loaded should
  * return a value to define the module corresponding to the first argument's
  * name.
  */
  define = function (name, deps, callback) {
    var node, context;
  
    //Allow for anonymous modules
    if (typeof name !== 'string') {
      //Adjust args appropriately
      callback = deps;
      deps = name;
      name = null;
    }
  
    //This module may not have dependencies
    if (!isArray(deps)) {
      callback = deps;
      deps = null;
    }
  
    //If no name, and callback is a function, then figure out if it a
    //CommonJS thing with dependencies.
    if (!deps && isFunction(callback)) {
      deps = [];
      //Remove comments from the callback string,
      //look for require calls, and pull them into the dependencies,
      //but only if there are function args.
      if (callback.length) {
        callback
                    .toString()
                    .replace(commentRegExp, '')
                    .replace(cjsRequireRegExp, function (match, dep) {
                      deps.push(dep);
                    });
  
        //May be a CommonJS thing even without require calls, but still
        //could use exports, and module. Avoid doing exports and module
        //work though if it just needs require.
        //REQUIRES the function to expect the CommonJS variables in the
        //order listed below.
        deps = (callback.length === 1 ? ['require'] : ['require', 'exports', 'module']).concat(deps);
      }
    }
  
    //If in IE 6-8 and hit an anonymous define() call, do the interactive
    //work.
    if (useInteractive) {
      node = currentlyAddingScript || getInteractiveScript();
      if (node) {
        if (!name) {
          name = node.getAttribute('data-requiremodule');
        }
        context = contexts[node.getAttribute('data-requirecontext')];
      }
    }
  
    //Always save off evaluating the def call until the script onload handler.
    //This allows multiple modules to be in a file without prematurely
    //tracing dependencies, and allows for anonymous module support,
    //where the module name is not known until the script onload event
    //occurs. If no context, use the global queue, and get it processed
    //in the onscript load callback.
    (context ? context.defQueue : globalDefQueue).push([name, deps, callback]);
  };
  
    define.amd = {
      jQuery: true
    };
  
  
    /**
    * Executes the text. Normally just uses eval, but can be modified
    * to use a better, environment-specific call. Only used for transpiling
    * loader plugins, not for plain JS modules.
    * @param {String} text the text to execute/evaluate.
    */
    req.exec = function (text) {
      /*jslint evil: true */
      return eval(text);
    };
  
    //Set up with config info.
    req(cfg);
  
    window.cfg = cfg;
    window.contexts = contexts;
  
  } (this));
  