Lockscreen: See through (2/2)

This commit was first adapted by @lion0738
This commit was Re-commited by @Namja in Triangles

Add the ability to see through lockscreen.
Adapted to kitkat from jellybean by @BigBrother1984

Credits to AOSPA

Change-Id: I9b647c10e3c88d1361233526a371c7e85596a205

Conflicts:
	res/values/cm_strings.xml
	res/xml/lockscreen_interface_settings.xml