title: Swift Navigation Bar Button and Title don't appear
body: <p>I'd like to create a Navigation bar on top of my App. I created an Navigation Controller -> Tab Bar Controller -> Navigation Controller -> Table Controller</p>
  
  <ol>
  <li>I dragged a Bar Button Item on the upper right side.</li>
  <li>I double clicked the title in the middle of the Table Controller and wrote a text.</li>
  <li><p>I also tried it with this code in the viewDidLoad() of my controller:</p>
  
  <pre><code>self.navigationController.navigationBar.topItem.title = "some title"
  self.navigationItem.setRightBarButtonItem(UIBarButtonItem(barButtonSystemItem: .Search, target: self, action: "barButtonItemClicked:"), animated: true)
  self.navigationItem.title = "YourTitle"
  </code></pre></li>
  </ol>
  
  <p>Non of it worked - what am I doing wrong? :/</p>