Base: change UserTile view

using a Rounded Image

https://www.dropbox.com/s/qf8qga911o88fmo/Screenshot_2014-02-24-03-04-21.png

add FlipTile for this
Front = new View
Back = default view

Change-Id: I4fb1c88f8abcb91ed67f0a6334634d7c39df6df4

Conflicts:
	packages/SystemUI/res/layout/quick_settings_tile_user.xml