Silent Hours

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v4.2.1:
- Now works on Android 5.0 Lollipop! (NOTE: The volume will be locked when the app silences the device, you will have to change the notification mode to "All" to abort the silent period prematurely)
- Added "indefinite" mode to quick mute and increased max time to 8 hours (640 min)
- Graphical updates for Android 4.4 and up.