Lots of clean up on the messaging notification sample to show the real
correct way to do things. Also mark up a bunch of the sample for use
in the documentation.
Change-Id: I3a29a944c2971e142c33b29aff94b1ba0b40ae0e
Shows how to make a basic custom theme with a custom background,
and a theme that selects between the old theme and Holo.
Also use a little trick to make the API demos for HC specific
samples be hidden on older versions of the platform.
Change-Id: Ie53e8103147e81975fca73b96bda989a00504534
