WIP Settings: Lockscreen custom wallpaper (2/2) not merge yet

  - Color Fill
  - Custom Wallpaper
  - Default background
  - Alpha slider in color fill
merged http://review.gummyrom.com/#/c/1226/4

Change-Id: I6d695101c1f4468a0df6d4c3a4a907cc272401ab

Conflicts:

	res/values/bam_strings.xml