[TIMOB-23684] iOS: Expose missing iOS8 properties to hide NavigationBar

   var win = Ti.UI.createWindow({
   	backgroundColor:"#fff",
   	title: "TIMOB-23684",
   	layout: "vertical"
   });
   
   win.add(createButtonWithAction("hidesBarsOnSwipe"));
   win.add(createButtonWithAction("hidesBarsOnTap"));
   win.add(createButtonWithAction("hidesBarsWhenVerticallyCompact"));
   win.add(createButtonWithAction("hidesBarsWhenKeyboardAppears"));
   
   win.add(Ti.UI.createTextField({width: 200,height:50,backgroundColor: "#ccc", top: 20}))
   
   var nav = Ti.UI.iOS.createNavigationWindow({
   	window: win
   });
   
   nav.open();
   
   function createButtonWithAction(action) {
   	var btn = Ti.UI.createButton({
   		title: action,
   		top: 60
   	});
   	
   	btn.addEventListener("click", function() {
   		win[action] = true;
   	});
   
   	return btn;
   }