code: function loadPackage(themePackage) {
          var fileName = themePackage.path + "/" + themePackage.metadata.theme.file;
          return loadFile(fileName, themePackage.metadata);
      }
docs: Loads a theme from an extension package.
  
  @param {Object} themePackage is a package from the extension manager for the theme to be loaded.
  @return {$.Promise} promise object resolved with the theme to be loaded from the pacakge