Port forward: Volume rocker wake and Volume music controls

Policy: Volume rocker wake
--Stevespear426 based on roman's ICS code

Volume music controls
--gdanko

Fix volume track skip control with 3rd party applications
--Danesh

Change-Id: Ie4b5c77c6ef7fc062cd96345866db52d279345c9

Conflicts:
	core/java/android/provider/Settings.java