code: function _gpfTriggerListeners (eventObj, eventListeners) {
      var index,
          length = eventListeners.length;
      for (index = 0; index < length; ++index) {
          _gpfEventsFire.call(eventObj.scope, eventObj, {}, eventListeners[index]);
      }
  }
docs: Execute the listeners
  
  @param {gpf.events.Event} eventObj
  @param {gpf.events.Handler[]} eventListeners