Fixed issue 472, NPE on android 3.1 (and 3.0).
The Activity.getActionBar() method can only be called after
setContentView() has been invoked, as described here:
I couldn't think of any way to enforce this safely
(i.e. make the compiler kick up a stink if we didn't do it). As such,
I just put a comment above each usage of the ActionBarCompat class.
Another outstanding issue is a duplicate of 474, where it crashes when you
press the "Up" button from ManageRepos, but I'll create a different issue