Added background to actionBar

Added background to the action bar. It must be set via the stacked
background drawable function otherwise, it will not override the
backgrounds of the tabs themselves.

Also, we need to figure out how to tile the background of I will have to
use imagemagick/rsvg-convert during the image creation script to
generate appropriately sized images for the backgrounds for tiled
objects.
Tiled background for actionbar

There is now a repeated image for the action bar. Unfortunately I had to
mess with the bottom_menu.svg file used to generate the image because it
has extra space which it really shouldn't. I will have to talk to Doug
about this as I should not have had to spend over an hour in inkscape
messing with this.