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.