transparent lockscreen opt:

depends on lockscreen customization commit

Change-Id: Iccb93d45219b0ad71f7d184315b15f04e2e24604

Conflicts:

	AndroidManifest.xml
	res/values/strings.xml
	res/xml/prefs_lockscreen.xml
	src/com/android/settings/cyanogenmod/LockscreenInterface.java