title: Adding an init() Method to SKScene
body: <p>I'd like to add an <code>init()</code> to my class that inherits from SKScene instead of doing all my setup in the <code>didMoveToView()</code> method. The problem happens when I try to create a new instance of the scene <code>nextScene = Level1(fileNamed: "Level1")</code>. I get an error saying I need to pass in an NSCoder to my Level1 class instead of using <code>fileNamed:</code> and suggests doing <code>Level1(aCoder: NSCoder)</code>. I don't want to use an NSCoder, but rather the <code>fileNamed:</code> to create a new level. Has anyone else experienced this?</p>