Added LogOut Button...

…but it doesn’t show up after unwind and manual push segue. Both unwind
and push separately work fine, but it’s complaining about nested
animated pops. I tried making a custom unanimated segue but it just
didn’t do anything when it was called.
Fixed Navigation Bar Corruption.

John’s suggestion of using viewDidAppear works, and means you only
require one place to call checkForGameStateSegue. There’s just more of
a lag before you go to the right screen, but that’s probably okay?
Merge branch 'master' of https://github.com/cvcal/CycleOfViolence