Merge pull request #7 from icanzilb/swift

normalized() on CGPoint and CGVector now returns zero instead of NaN when the length of the vector is zero.
Removed conversions per email discussion
Merge pull request #8 from icanzilb/swift

Physics Debug Draw is built-in in SK now
Fixes for beta 4.
Merge pull request #9 from icanzilb/swift

Bug fix for background music
Removed SKEmitterNode+Extensions.

This functionality is now built into SpriteKit:

let emitter = SKEmitterNode(fileNamed: "AwesomeParticles")
Remove SKColor constructors in favor of SKColorWithRGB() and RGBA() functions.
Fixes for Xcode 6 beta 5.
Public accessor + Playground demo
Merge pull request #10 from corinnekrych/swift.with.workspace

Public accessor + Playground demo
Updated `bringToFront`

In beta 7, `self.parent` became a normal optional, not explicitly unwrapped. This causes the constant `parent` to be an optional. This new implementation handles the case where the node does not have a parent, and prevents having to explicitly unwrap later on.
Merge pull request #11 from edekhayser/swift

Updated `bringToFront`
Cleaning up the mess...
Moved the Playground workspace to Examples/Playground.
Cleaned up the README file.
Moved the unit tests to a new project.
Removed ! from method signatures where no longer needed.
Merge pull request #1 from raywenderlich/swift

Swift