title: UINavigationBar does not extend behind status bar
body: <p>I feel like I'm completely overlooking something, since this is so basic.</p>
  
  <p>In a completely bare bones setup:</p>
  
  <pre><code>window = UIWindow(frame: UIScreen.mainScreen().bounds)
  window.backgroundColor = UIColor.whiteColor()
  
  let rootController = MainViewController()
  rootNavigationController = UINavigationController(rootViewController: rootController)
  
  window.rootViewController = rootNavigationController;
  window.makeKeyAndVisible()
  
  // Appearance
  UINavigationBar.appearance().barTintColor = UIColor.DailyRate.blueColor
  UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()]
  UINavigationBar.appearance().opaque = false
  </code></pre>
  
  <p>I get a navigation bar that does <em>not</em> extend behind the status, which should be default behavior.</p>
  
  <p><a href="https://i.stack.imgur.com/FpIZ5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FpIZ5.png" alt="enter image description here"></a></p>