code: function(src) {
      var loadable;
  
      // Valid state name required
      if(!src || src === '') {
        var error;
        error = new Error('Loadable requires a valid source.');
        error.code = 'invalidname';
        throw error;
      }
  
      // Already exists
      if(_loadableHash[src]) {
        loadable = _loadableHash[src];
  
      // Create new
      } else {
        // Create new instance
        loadable = new _Loadable(src);
        _loadableHash[src] = loadable;
  
        // Broadcast creation, progress
        $rootScope.$broadcast('$loadableCreated', loadable);
        $rootScope.$broadcast('$loadableProgress', _getProgress());
  
        // Completion
        loadable.promise.then(function() {
  
          // Broadcast complete
          $rootScope.$broadcast('$loadableProgress', _getProgress());
          if(_loadingList.length === 0) {
            $rootScope.$broadcast('$loadableComplete', loadable);
          }
        });
      }
  
      return loadable;
    }
docs: Create a _Loadable.  Does not replace previously created instances.
  
  @param  {String}    src A source path for script asset
  @return {_Loadable}     A loadable instance