title: withSecurityScope not available in NSURL.BookmarkCreationOptions
body: <p>im am trying to save a url as a bookmark to persist access to files on an iphone.
  To do this i am calling the <code>bookmarkData</code> function.
  But to prevent errors i have encounterd such as:</p>
  
  <p><code>Error Domain=NSCocoaErrorDomain Code=260 "The file couldn’t be opened because it doesn’t exist."</code></p>
  
  <p>I am trying to add the <code>withSecurityScope</code> option when calling the function. 
  Although I have found multiple references to this option in the Apple documentation I can't seem to be able to find it when using <code>NSURL.BookmarkCreationOptions.withSecurityScope</code>. It only says <code>'withSecurityScope' is unavailable</code>. I have also looked through the class definition but still no luck.</p>
  
  <p>I hope someone can help me out here.
  Thanks a lot!</p>