title: What's the relationship between GameScene.swift and GameScene.sks files in SpriteKit template
body: <p>I've been playing around with SpriteKit, and am getting a pretty decent feel about how to drive it from code, but am pretty baffled by the level editor included in Xcode 6. </p>
  
  <p>I've watched the wwdc videos ("platforms state of union" and "what's new in spriteKit"), and scrounged around the web, but haven't been able to find much description about the level editor, and what it's really doing.  </p>
  
  <p>What I don't understand, is how are the two files that the template sets up related? Is the .sks file an expression of the GameScene.swift file, or perhaps the GameScene class it contains?  </p>
  
  <p>OR do they both just hold separate objects/nodes that are going to play together in the same scene?  </p>
  
  <p>Or (this is my best explanation) is the .sks file and the editor basically for making the environment that responsive characters are going to "live" in? If that's true, how can my code in the .swift file relate to what's in the .sks file?</p>