PixelArcade - a simple menu to select which game to play

It's a bit of hack, but it is a first run at merging games so you can pick which game to play
without having to download a new program.  The 'PixelArcade.ino' currently includes:

TheGreatRace
SnakePixel
SuperPixelBros
SpaceInvaders
Connect4
PixelBird
Dice2
Merge pull request #17 from bdowling/PixelArcade

PixelArcade - a simple menu to select which game to play