SimpleLibraryActivity: Refactor initialization and better debugging.

This changes the startActivityForResult to return a result so that
getCallingActivity() will work.

This fixes a bug where if a user had the popup open then another client cleared
the playlist (or the playlist cleared due to consume), THEN the button was hit
with a null current song, a crash would occur.
Tools: Add debug code for server response crashes.
gradle: Update for AS gradle plugin to 1.0.0.
dmix: Code style.
RemoteControlClientHandler: Test patch to attempt to avoid RCC recycle bug.

Yet another attempt to fix the RCC recycle bug. This patch changes the
behaviour to always completely reset the remote control client when adding
artwork. This patch might not work, but it certainly couldn't make things
worse. This will either get improved upon later or reverted.
NetworkActivityHandler: Remove.

Remove the NetworkActivityHandler. It was an idea whose time was not ready for
MPDroid. Some of this code might be resurrected once the core connection code
is repaired, but for the most part I expect this code to be radically
different.
CommandQueue: Make class and more public.
CommandQueue: Implement Iterable.
Reflection: Implement reflection subsystem.
subsystem: Move Sticker class into the subsystem package.
SimpleLibraryActivity: Remove some unnecessary nesting.
Try to keep people from building closedbits. Ugh
Get your own key guys.
Add a new dialog to thank users that saw the google play
1.07.2 Final
Merge branch 'release/1_07_2_final'
Merge tag '1_07_2_final' into develop

1_07_2_final
MPDroid: Update library dependencies.
AlbumsFragment: Prior to getString() check for an active activity.
RemoteControlClientHandler: onCoverUpdate() check for a current track.

It's unlucky, but it can happen that prior to albumart decoding completion, the
server playlist queue can be cleared and there will be no current track. This
commit checks the current track for non-nullity prior to updating the remote
control client object with a cover bitmap.