title: Requirejs optimizer and mainConfigFile errors
body: <p>I am attempting to run r.js against our webapp, but am running into the following error:</p>
  
  <blockquote>
    <p>Error: Error: The config in mainConfigFile /home/ubuntu/dev/proj/web/insight/js/main.js cannot be used because it cannot be evaluated correctly while running in the optimizer. Try only using a config that is also valid JSON, or do not use mainConfigFile and instead copy the config values needed into a build file or command line arguments given to the optimizer.<br>
    Source error from parsing: /home/ubuntu/dev/proj/web/insight/js/main.js: SyntaxError: Duplicate data property in object literal not allowed in strict mode
        at /home/ubuntu/dev/proj/deploy/r.js:26725:27</p>
  </blockquote>
  
  <p>My build.js file is:</p>
  
  <pre><code>({
      appDir: "../web/insight",
      baseUrl: "js/",
      mainConfigFile: "../web/insight/js/main.js",
      dir: "insightui-build",
      modules: [
          {
              name: "main"
          }
      ],
      paths: {
          "jquery": "empty:",
          "backbone": "empty:",
          "underscore": "empty:",
          "handlebars": "empty:",
      }
  })
  </code></pre>
  
  <p>My main.js is:</p>
  
  <pre><code>require.config({
  paths: {
  //  Libraries
  // (Look at upgrading: Handlebars, Bootstrap, LESS, Backbone, Underscore
      jquery              : '//code.jquery.com/jquery-1.11.0.min',
      backbone            : '//cdnjs.cloudflare.com/ajax/libs/backbone.js/1.0.0/backbone-min',
      underscore          : '//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min',
      handlebars          : '//cdnjs.cloudflare.com/ajax/libs/handlebars.js/1.0.rc.1/handlebars.min',
      bootstrap           : '//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min',
      highcharts          : '//cdnjs.cloudflare.com/ajax/libs/highcharts/3.0.2/highcharts',
      leaflet             : '//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet',
      less                : '//cdnjs.cloudflare.com/ajax/libs/less.js/1.3.3/less.min',
      common              : '../shared/js/common',
      config              : 'config',
  //  Views
      DefaultView         : 'views/defaultView',
      LoginView           : 'views/LoginView',
      ResetPassView       : 'views/EmailView',
      SetPassView         : 'views/SetPassView',
      SetEmailView        : 'views/SetEmailView',
      ResetPassView       : 'views/ResetPassView',
      HomeView            : 'views/HomeView',
      FleetView           : 'views/FleetView',
      FleetSitesView      : 'views/FleetSitesView',
      FleetOpsView        : 'views/FleetOpsView',
      FleetInstsView      : 'views/FleetInstsView',
      InstProfileView     : 'views/InstProfileView',
      InviteView          : 'views/InviteView',
      OpProfileView       : 'views/OpProfileView',
      SiteProfileView     : 'views/SiteProfileView',
      SupportView         : 'views/SupportView',
      TestsView           : 'views/TestsView',
      TestDetailView      : 'views/TestDetailView',
      UsersView           : 'views/UsersView',
      UserSettingsView    : 'views/settings/UserSettingsView',
  //  Shared Subviews
      ActivityFeedView    : 'views/shared/ActivityFeedView',
      AllNotifView        : 'views/shared/AllNotifView',
      FooterView          : 'views/shared/FooterView',
      HeaderView          : 'views/shared/HeaderView',
      NotifListView       : 'views/shared/NotifListView',
      ProfileChartView    : 'views/shared/ProfileChartView',
  //  Settings Subviews
      AddInstView         : 'views/settings/AddInstView',
      AddOpView           : 'views/settings/AddOpView', 
      AddUserView         : 'views/settings/AddUserView',
      EditInstView        : 'views/settings/EditInstView',
      EditSiteView        : 'views/settings/EditSiteView',
      EditUserView        : 'views/settings/EditUserView',
  //  Models
      MultiModel          : '../shared/js/models/MultiModel',
      NotifModel          : '../shared/js/models/NotifModel',
      InstModel           : 'models/InstModel',
      OpModel             : 'models/OpModel',
      SiteModel           : 'models/SiteModel',
      TestModel           : 'models/TestModel',
      UserModel           : 'models/UserModel',
  //  Collections
      NotifCollection     : '../shared/js/collections/NotifCollection',
      InstsCollection     : 'collections/InstsCollection',
      InviteCollection    : 'collections/InviteCollection',
      OpsCollection       : 'collections/OpsCollection',
      SitesCollection     : 'collections/SitesCollection',
      TestsCollection     : 'collections/TestsCollection',
      UsersCollection     : 'collections/UsersCollection',
  //  Templates
      templates           : '../templates',
  },
  
  shim: {
      underscore: {
        exports: '_'
      },
      backbone: {
          deps: ['underscore', 'jquery'],
          exports: 'Backbone'
      },
      handlebars: {
          exports: 'Handlebars'
      },
      bootstrap: {
        deps: ['jquery'],
        exports: '$'
      },
      highcharts: {
          deps: ['jquery'],
          exports: 'Highcharts'
      },
      leaflet: {
          exports: 'L'
      }
  }
  });
  
  require([ // Load our app module and pass it to our definition function
      'app',
      ], function(App){
      // The "app" dependency is passed in as "App"
      App.initialize();
  });
  </code></pre>
  
  <p>I've exhausted searching google.  I thought I could just plug in main.js as the mainConfigFile and it would take off, but apparently I have some other issue(s).  Thanks in advance for any help.</p>