title: Crashing when trying to pull image from URL with Swift
body: <p>I am saving the image url successfully from an api and am having issues showing it when I run the app. avatarString has the correct url but as soon as I get to the next line I keep getting:</p>
  
  <blockquote>
    <p>fatal error: unexpectedly found nil while unwrapping an Optional value</p>
  </blockquote>
  
  <p>My avatarData var is returning as nil. I don't know what why. Running Xcode Beta 6.3. Thanks for any help.</p>
  
  <pre><code>    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
  
          var avatarString = NSURL(string: self.userInfo.avatarURL)!
  
  
          var avatarData = NSData(contentsOfURL: avatarString, options: nil, error: nil)
  
          var avatarImage = UIImage(data: avatarData!)
  
          self.avatarImage.image = avatarImage
  
      })
  </code></pre>