Initially adding rendering code to project
The renderer is smart enough to get its geometry scene data from the *.sks file now, rendering outline of those nodes.
This is problematic, however, for a number of reasons:

1. XCode's level designer is buggy - it crashes regularly (every few minutes in many cases) and it also forgets
   the physics bounds, which get reset to the unit rectangle (which doesn't properly cover the entire sprite it
   is meant to represent.)
2. It only allows us to use rectangles - no lines.
3. It doesn't afford us a means for representing the rendering material parameters.
4. it doesn't allow us to specify the spawn points of the player, enemies, power-ups, etc.
5. Probably a lot more reasons.

In fact, I found myself twice today, going to developer.apple.com praying for an updated version of XCode with
hopes that it might solve some of these issues!	 :)
Merge pull request #1 from jocelynlih/paul

Initially adding rendering code to project
We can now load levels from PNG files. See the Levels directory.
Merge pull request #2 from jocelynlih/paul

We can now load levels from PNG files. See the Levels directory.
Add background, Add pencil, Add physics and Input: touch to jump
Merge branch 'master' of https://github.com/jocelynlih/SwiftGameBook
Add parallax scrolling background.