New AOKP Changelog

Added new changelog card
MergedTab: Added constructor to enable using it as a fragment directly

Note: The merged tab does not update when the spinner changes
No searching is available on the changelog screen

Change-Id: I065113483fa83c04f8d7c22d021f975a98ea18e0
Update project to use new gradle version

As required in latest Android Studio update

Change-Id: I608ab38ab9c070fb3f4984b6defe327d6ca84df7
Gson deserialise changelog object

Change-Id: Ib03738e25864c165394633b3498ef5674496f894
Use customised SearchView

Let the SearchView handle its own processing
Added new search icons
Move the searchview out of the action bar and into the layout
 so it can occupy the full screen width

Change-Id: Icda9ab05231ee33d428076b26a8867d54268d916