Merge pull request #66 from jocelynlih/paul

Added exit button art
Merge pull request #68 from jocelynlih/paul

Paul
So we will set for 4 levels :)
Add more power ups to level.
Merge pull request #69 from jocelynlih/jocelyn

Add more power ups to level 2 and downsize to 4 levels.
Add level 3 and 4 sks name holder file to project. Hook up correct name in level select scene.
Merge pull request #70 from jocelynlih/jocelynlevel

Add level 3 and 4 sks name holder file to project. Hook up correct name ...
Upgrading to Xcode6 Beta6