game.c: Use SDLK_ESCAPE to quit during a game.
Merge pull request #1 from hi-ban/master

Added parallax scrolling. Added player frames.
Add a copyright file.
Merge pull request #2 from hi-ban/master

Added graphics for the rectangles.
Link with SDL_image.
Optimise PNG images. For some reason, this reduces CPU usage when drawing.
Merge pull request #1 from Nebuleon/master

pull from nebuleon/hocoslamfy