     // MARK: - WKNavigationDelegate
     
     func webView(webView: WKWebView, didFailNavigation navigation: WKNavigation!, withError error: NSError) {
-        print("didFailNavigation")
     }
     
     func webView(webView: WKWebView, didFinishNavigation navigation: WKNavigation!) {

                constant: 0)
            ])
        
        self.webView!.navigationDelegate                  = self
        self.webView!.allowsBackForwardNavigationGestures = true
        playlistButton        = UIBarButtonItem(image: UIImage(named: "playlist"),
                                                style: UIBarButtonItemStyle.Plain,

        let script = WKUserScript(source: getSource(), injectionTime: WKUserScriptInjectionTime.AtDocumentEnd, forMainFrameOnly: false)
        let userContentController = WKUserContentController()
        userContentController.addUserScript(script)
        let configuration = WKWebViewConfiguration()
        configuration.userContentController = userContentController;
        return WKWebView(frame: self.view.bounds, configuration: configuration)
