Fixes tabdrop memory leak U4-6907 Bootstrap tab drop has memory leaks, fixes tab/header to use the correct bootstrap tab api, simplifies the header code dramatically and speeds up processing. Fixes mem leak with delayedMouseLeave.directive

src/Umbraco.Web.UI.Client/bower.json

@@ -25,7 +25,6 @@
     "jquery-ui": "1.10.3",
     "angular-dynamic-locale": "~0.1.27",
     "tinymce": "~4.1.10",
-    "bootstrap-tabdrop": "~1.0.0",
     "codemirror": "~5.3.0"
   }
 }