HALO: new drawables for hdpi and mdpi

- scaled down the xhdpi drawables properly for hdpi and mdpi
- removed some old and unused halo pngs
Merge pull request #23 from tonyp/jellybean

HALO: new drawables for hdpi and mdpi
Lock screen: Hide initial pages hints feature (1/2)
-Port and adapt of hide hints for initial page AOKP's idea (Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>).
 Option stored in lock screen settings.
-Moved last brightness strings in brightness section and fixed some code alignment.
Merge remote-tracking branch 'upstream/jellybean' into jellybean-legacy