Added a sliding menu repeatable background. Other screen densities will
be added once the motif has been finalised (currently it is only XHDPI).
The implementation of a useful and smart fragment changing system is
next on the to-do list as currently multiple of the same fragment can be
stacked... causing either lag or a long back stack that takes longer to
navigate.

Signed-off-by: Conrad Haupt <me@conradhaupt.co.za>