Merge pull request #21 from OldSneerJaw/dev

Thread safe TimerManager creation
Merge pull request #22 from OldSneerJaw/dev

Additional tests & refactoring
Implemented a service to handle requesting and holding onto audio focus indefinitely so that Rdio playback remains paused. Read more: https://github.com/rdio/api/issues/90
Merge pull request #23 from OldSneerJaw/pause-rdio

Pause Rdio playback