fix(kbItem): Remove dependency on jQuery `is` method.

Fixes #1.
Add support for menu’s (Issue #3)

* Expose the invoke event via: kb-invoke
* ng-model no longer required for kb-list
Added menu example

Closes #3
Removed dist folder
Builds moved to the bfanger/bower-angular-keyboard repository
Fixes

* Also update the ng-model value on **de**select.
* kbItem disables tabbing to :tabbable elements.
  (Ensures using tab between lists and arrow keys between items)
Moved example hosting to heroku
docs(Readme): Fix broken link in readme, add kbInvoke documentation.