The new support library features and sample code for switching
between fragments using a TabHost now eliminates the utility of
the TabActivity class, so deprecate it. This also means there is
no longer any use in ActivityGroup or LocalActivityManager. Yay.
Also fix up things so the new support API demos are included in
the documentation.
Change-Id: I4f073b82787f32560ba1fa5b6a23746ecc8aecdc
2f04883ff8