Add virtual scrolling AngularJS module

Integrated virtual scrolling in contacts.

UI/WebServerResources/bower.json

@@ -7,6 +7,7 @@
     "angular-ui-router": "~0.2",
     "angular-foundation": "~0.3",
     "angular-recursion": "~1.0",
+    "angular-vs-repeat": ">=1.0",
     "foundation": ">5.3",
     "ionic": "1.0.0-beta.11",
     "underscore": "~1.6"