The MainActivity is acting as both a view and a controller of the entire app, separating that responsibility to the new MainApp class.
Also, I don;t like seeing instance count violations, because I have no idea if they are contributing to app crashes.
https://github.com/mozilla/MozStumbler/issues/7
After this refactor, I no longer see this issue.
Merge pull request #649 from garvankeeley/fix-rotation-crash

Separate responsibility of MainActivity, fix strict mode violations