Updated app to support iPhone 5 and it's larger screen.  Also, misc bug fixes...

I stumbled on your game when I was looking for a small project to work on this afternoon.  I added full support for the iPhone5 screen size (added additional XIB files) as well as the following misc fixes:

- Added an alert message when multiplayer option is chosen so that the user doesn't actually open up that view.  Since multiplayer isn't fully finished, I thought this was the better option than just getting rid of it altogether.

- Changed how the HighScores plist was accessed.  It was accessing the Main Bundle which is readonly (may not have noticed during the development since it still worked on the simulator, but not on an actual device.

- Some misc command-line debugging code.

Thanks for the app, this provided some good practice for me.  Hope you determine it to be worthy of merging with the orignal repo!

Tim