code: function (eventName,handler) {
  			var event;
  			if (event = this.getEvent(eventName))
  			{
  				if (!event.addListener(handler))
  					this.e.log('Invalid handler sent to event `'+eventName+'` on `'+this.getConfig('id')+'`','warning');
  			} else
  				this.e.log('Not existent event `'+eventName+'` on `'+this.getConfig('id')+'`','warning');
  			return this;
  		}
docs: Add a new listener to the event, if it exists
  @param string $eventName event name
  @param function $handler event handler
  @return this