Custom lockscreen background, (1/2):

Thanks to OmniRom:
https://github.com/omnirom/android_frameworks_base/commit/b436ccb647060ea1e5ecb86a20425fa931d65166

Included:
- Custom lockscreen image
- Lockscreen image blur
- Option to enable/disable colorizing the lockscreen background
  (color overlay)
- Custom lockscreen background color and transparency