added credit screen, and viewcontroller files
back button added to credit screen
added basic credit screen
added ball class
commit
commit
commit
chagned button animation implementaion
made fadeIn method
messing around with ball method
Merge branch 'master' of github.com:joxenford/KCT_SpriteKit

Conflicts:
	SpriteKitTest.xcodeproj/project.pbxproj