Merge changes from topic 'fullbleed'

* changes:
  Added bigger notification paddings above and below groups
  Replacing alpha with shadowAlpha
  Fixed the divider height to be at least 1px high
  Added transparency to the notification backgrounds on the lockscreen
  Animating background of the notifications now
  Drawing the background of the notifications as a grey color now
  Refactored the interpolators to use only one single instance
  Removed the visual speedbump
  Remove the scale animation from the lockscreen
  Removed notification top padding
  Removed round rect clipping for notifications and qs
  Removed notification side paddings