cleanup

public/app/features/panel/panel_directive.ts

@@ -1,8 +1,9 @@
 ///<reference path="../../headers/common.d.ts" />
 
-import angular from "angular";
-import $ from "jquery";
-import Drop from "tether-drop";
+import angular from 'angular';
+import $ from 'jquery';
+import _ from 'lodash';
+import Drop from 'tether-drop';
 
 var module = angular.module('grafana.directives');