AngularJS Demo Plugin

This plugin does the following

- Add Test main tab
- when selected, Test main tab sends message to the plugin
- plugin validates the message and invokes function on Test main tab
- Test main tab's function updates AngularJS scope which in turn updates
  tab UI

This plugin uses AngularJS Javascript framework

* AngularJS, Model-View-Controller framework for JavaScript
  http://angularjs.org/

Change-Id: Ibd6965c7317378d310682e5efb3eb974ec04cd00
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>