WallpaperCropper: include wallpapers from themes!

Theme all the things!!!!!!!!!

Change-Id: Ie9d5d4dfe6533442188e38fa0b11742368246e37
Signed-off-by: Roman Birg <roman@cyngn.com>

Conflicts:
	packages/WallpaperCropper/src/com/android/wallpapercropper/LockWallpaperPickerActivity.java