Did some yak shaving.
This depends on #19.
Clean up uses of libPusher.
This removes all uses of pusher, leaving some commented in handling
code so we don't need to re-write it later.
Use Xcode's recommendations for moving to ARC.
Remove iVars and @synthesize in Play Item.
Use literals in iOS.
iOS app gets arc.
Make playURL a property… and a URL.