title: iOS8 Interface Rotation Methods not called
body: <p>Since <code>willAnimateRotationToInterfaceOrientation:duration:</code> is <a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/#//apple_ref/occ/instm/UIViewController/willAnimateRotationToInterfaceOrientation:duration:" rel="noreferrer">deprecated</a> in iOS8, one needs to use <code>viewWillTransitionToSize:withTransitionCoordinator:</code> <a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIContentContainer_Ref/index.html#//apple_ref/occ/intfm/UIContentContainer/viewWillTransitionToSize:withTransitionCoordinator:" rel="noreferrer">instead</a>.</p>
  
  <p>However, this method does not get called in my view controller on iOS8. 
  Is there anything else, I need to implement, in order for this callback to work? </p>
  
  <p>I cannot find anything in the documentation. The only thing I could find, was that it belongs to the new <code>UIContentContainer</code>  protocol. However, even if I am adding this to the protocols of my controller explicitly, it does not work.</p>
  
  <p>Any ideas?</p>