Frameworks: Lockscreen custom wallpaper 1/2
  - Color Fill
  - Custom Wallpaper
  - Default background
  - Alpha slider in color fill

Change-Id: I22a2445a8e5f2bd0184a31aae83ed0f9c99a254f

Conflicts:

	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java