title: how to create atlas files for Sprite Kit?
body: <p>I've just been toying with SpriteKit, and Ive noticed that the Apple examples use SpriteKit with "atlas" extensions. As they don't use them in Xcode, what I've dome is use |"Asset files"| and renamed them to ".atlas"</p>
  
  <p>Is this the correct way to go about this or am I missing a few templates?</p>
  
  <p>Also, on top of that, is there a way I can bundle the sound files (I don't care what format as I can re-encode them) so that they are also formatted into a single archive?</p>