Add Quick Settings USB Tether tile (2 of 2)

Patch Set 8: Make tile dynamic

- Thanks to Björn Lundén for the drawables

Change-Id: I414848f6cb8a789d0b5edfcb79ab53cb85ebc20e
Updated framework - added wallpapers and changed power menu to have reboot on the main menu

Change-Id: Ifd138a50096eb336168996cf23450f4d9d45202f