title: PFUser.currentUser() never equals nil
body: <p>I'm getting a strange behavior with Swift and Xcode 7. This didn't happen on Xcode 6. I have disabled Anonymous users on Parse. I have logged out the current user. Every time I come back to the login screen...whether I logout the user in the background or even if i logout and then restart the app the PFUser.currentUser() never equals nil. It always allows the user to get to the main screen. I have even tried to logout the user right before the following statement is execute, but PFUser.currentUser() still not nil! </p>
  
  <p>Anyone having the same problem? This started happing after the update. </p>
  
  <pre><code>if PFUser.currentUser() != nil {
                  // Do stuff with the user
                  let storyboard = UIStoryboard(name: "main", bundle: nil)
                  let controller = storyboard.instantiateViewControllerWithIdentifier("mainVC")
                  self.presentViewController(controller, animated: true, completion: nil)
  
              }
  </code></pre>