code: function loadFile(fileName, options) {
          var deferred         = new $.Deferred(),
              file             = FileSystem.getFileForPath(fileName),
              currentThemeName = prefs.get("theme");
  
          file.exists(function (err, exists) {
              var theme;
  
              if (exists) {
                  theme = new Theme(file, options);
                  loadedThemes[theme.name] = theme;
                  ThemeSettings._setThemes(loadedThemes);
  
                  // For themes that are loaded after ThemeManager has been loaded,
                  // we should check if it's the current theme.  If it is, then we just
                  // load it.
                  if (currentThemeName === theme.name) {
                      refresh(true);
                  }
  
                  deferred.resolve(theme);
              } else if (err || !exists) {
                  deferred.reject(err);
              }
          });
  
          return deferred.promise();
      }
docs: Loads a theme from a file.
  
  @param {string} fileName is the full path to the file to be opened
  @param {Object} options is an optional parameter to specify metadata
  for the theme.
  @return {$.Promise} promise object resolved with the theme to be loaded from fileName