Background

Added space background + scroll effect to program. This background works
on my device, but will probably not scale to size on other devices
collision detection scratch

created scratch program that tests the idea of collision detection
Documents

added in a folder called "documents" that contains our journal, release
schedule, sources, specs sheet, and our WIPs
Merge pull request #7 from weihanli101/background

Background, collision detection (scratch program), and documents