code: function _gpfRemoveEventListener (event, eventsHandler) {
      /*jshint validthis:true*/ // will be invoked as an object method
      var listeners = this._eventDispatcherListeners,
          eventListeners,
          index;
      if (listeners) {
          eventListeners = listeners[event];
          if (undefined !== eventListeners) {
              index = eventListeners.indexOf(eventsHandler);
              if (-1 !== index) {
                  eventListeners.splice(index, 1);
              }
          }
      }
      return this;
  }
docs: Remove an event listener from the dispatcher
  
  @param {String} event name
  @param {gpf.events.Handler} eventsHandler
  @gpf:chainable