title: 'UIStoryboard.type' does not have member named 'centerViewController'
body: <p>I am following <a href="http://www.raywenderlich.com/78568/create-slide-out-navigation-panel-swift" rel="nofollow">THIS</a> tutorial but I didn't downloaded starter project file from that tutorial because I want to make it differently but I am stuck here since an hour because I got this Error:</p>
  
  <pre><code>'UIStoryboard.type' does not have member named 'centerViewController'
  </code></pre>
  
  <p>Here I am trying to add subView (CenterViewController) into ContainerViewController.</p>
  
  <p>Here is my code for <strong>ContainerViewController.swift</strong></p>
  
  <pre><code>import UIKit
  import QuartzCore
  
  class ContainerViewController: UIViewController, CenterViewControllerDelegate {
  
  var centerNavigationController: UINavigationController!
  var centerViewController: CenterViewController!
  
  
  override init() {
      super.init(nibName: nil, bundle: nil)
  }
  
  required init(coder aDecoder: NSCoder) {
      super.init(coder: aDecoder)
  }
  
  
  override func viewDidLoad() {
      super.viewDidLoad()
  
      centerViewController = UIStoryboard.centerViewController()    
      //'UIStoryboard.type' does not have member named 'centerViewController'
      centerViewController.delegate = self
  
  
      // wrap the centerViewController in a navigation controller, so we can push views to it
      // and display bar button items in the navigation bar
      centerNavigationController = UINavigationController(rootViewController: centerViewController)
      view.addSubview(centerNavigationController.view)
      addChildViewController(centerNavigationController)
  
      centerNavigationController.didMoveToParentViewController(self)
  
     }
  
  }
  </code></pre>
  
  <p>This is my <strong>CenterViewController.swift</strong></p>
  
  <pre><code>import UIKit
  
  @objc
  protocol CenterViewControllerDelegate {
  optional func toggleLeftPanel()
  optional func collapseSidePanels()
  }
  
  class CenterViewController: UIViewController {
  
  var delegate: CenterViewControllerDelegate?
  
  @IBAction func tableTapped(sender: AnyObject) {
  
      }
  }
  </code></pre>
  
  <p>And this is my <strong>AppDelegate.swift</strong></p>
  
  <pre><code>func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -&gt; Bool {
      window = UIWindow(frame: UIScreen.mainScreen().bounds)
  
      let containerViewController = ContainerViewController()
  
      window!.rootViewController = containerViewController
      window!.makeKeyAndVisible()
      return true
  }
  </code></pre>
  
  <p>Can anyOne give me any Idea what I am missing? </p>