Removed the now-obsolete ActionBar API guide; it's been
superseded by the AppBar training class
(http://developer.android.com/training/appbar/ )
Changed the most important ActionBar links and references to point to
the AppBar docs (or some other appropriate page).
A separate CL will set up redirects from the ActionBar API guide.
See first comment for doc stage location.
bug: 25194804
Change-Id: I0859ea1712971fcf2f6cf131b2a5221b5bf3ea44
List of issues from https://code.google.com/p/android/issues that are fixed by this CL: 183476,183249,183248,183241,183222,183142,183093,183329,182385,182311,182193,182019,73149,181589,179740,179384,178322,178189,178086,178020,177169,176312,175138,172322,172030,171820,170647,167288,163574,161580,161041,159199,151347,144290,136137,132505
Change-Id: I2e96f7444048abd2f666c75bd6ab9640019afb75
