Lockscreen Blur

- If user selects "See through" under screen security,
  the locksceen background will now appear transparent
  with the content behind it blurred.

PS2-6 : remove whitespaces
PS10  : Link blur to see through lockscreen option
PA12  : Lets actually push some changes this time :)

Change-Id: Iac581536057ef6b8eb4637b1172291f47463a065

Conflicts:

	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
	services/java/com/android/server/power/DisplayPowerController.java