exit sign assets
We can't use the frame for our ground plane. The frame is set to AspectFill, so the frame extends beyond the top/bottom of the screen. I've created a "viewableArea" as part of our GameScene class so we can use that rect to specify scene-frame-relative coordinates within the view space. The ground plane has been adjusted to this.
Merge pull request #68 from jocelynlih/paul

Paul