title: UIViewController in UIPopoverController always reports as being in Portrait mode
body: <p>I've got a view controller in a UIPopoverController. I want to adjust the ui based on whether or not it is in portrait orientation.</p>
  
  <p>No matter what orientation my iPad is in (physical device), self.interfaceOrientation always reports Portrait. I'm logging it in -viewWillAppear: and it's always Portrait.</p>
  
  <p>Why?</p>