title: Storyboard relationship in iOS
body: <p>I'm attempting to use the new Storyboard feature, however I am confused about Storyboard Relationships? How are they different to IBOutlets?</p>
  
  <p>Also how can I add my own relationship, to my own UIViewController subclass?</p>
  
  <p>I have tried looking in the documentation but can't find much about them.</p>