title: I need to fetch a JSON in a URL
body: <p>I read this about the URL Loading System:</p>
  
  <p><a href="https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/URLLoadingSystem/URLLoadingSystem.html#//apple_ref/doc/uid/10000165i" rel="nofollow">https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/URLLoadingSystem/URLLoadingSystem.html#//apple_ref/doc/uid/10000165i</a></p>
  
  <p>Can't figure out what class use and how to use it.</p>
  
  <p><a href="http://i.stack.imgur.com/MlNSY.jpg" rel="nofollow">errorSreenshot</a></p>