Lockscreen: See through (2/2)

- Based on @BigBrother1984 implementation from this commit: 4e061d4b26b06499b3eddfaaf3564094851a4c2a

Change-Id: I11f3fa8ef477d08e4a9398099206f1a7ae3b6d8d

Conflicts:
	res/xml/lockscreen_interface_settings.xml
	src/com/android/settings/cyanogenmod/LockscreenInterface.java

Conflicts:
	res/values/cr_strings.xml
	res/xml/lockscreen_interface_settings.xml
	src/com/android/settings/cyanogenmod/LockscreenInterface.java