Move help to an ActionBarActivity

- Has a modern appearence, congruous with the rest of the app.
- Allows for up navigation on action bar so the user doesn't have to back
  through every page viewed when they want to escape help.
Set support action bar logo
Remove GamePlay to Chooser animation on back key press

The hierarchy has switched so need to change this round
Merge pull request #146 from doopl/master

Move help to an ActionBarActivity