* Starting to remove PlayerActivity.currentActivity and
PlayerActivity.currentContext
Moved ButtonManager to PlayerActivity
Notification manager "Notifications" moved to global application
context.
Decoupled DownloadCurrentinfo from other classes.
DownloadCurrentinfo does not need a Handler anymore (AsycnTask).
PlayerActivity and PlayerService decoupled.
This version is buildable and does the same.
Fixed a little bug. NowPlayingInfo not cached.
Merge pull request #11 from berfenger/master

Decoupled code