Unbind all cached event listeners
function unbindListeners() {
	  if (this && this.eventListeners) {
	    this.eventListeners.forEach(function (item) {
	      var element = item.element,
	          type = item.type,
	          callback = item.callback,
	          options = item.options;
	      element.removeEventListener(type, callback, options);
	    });
	    this.eventListeners = [];
	  }
	}