Add Muzei Watch Face, other minor fixes

- Add official Muzei watch face to Wear app
- Minor fixes to full screen Wear app
- Adds example-watchface
- Renames :provider to :android-client-common
- Updates for Android Studio 1.0, Google Play Services 6.5
- Fix minor ProGuard issues, enable shrinkResources
Merge branch 'master' of https://github.com/romannurik/muzei