add GameCenterLogin-window to the GameViewController and fix size of the MenueScene

GoldWars/GoldWars/GameViewController.swift

@@ -17,7 +17,6 @@ class GameViewController: UIViewController {
     
         if let view = self.view as! SKView? {
             if let scene = SKScene(fileNamed: "MenuScene") {
-				scene.size = self.view.bounds.size
                 scene.scaleMode = .aspectFill
                 view.presentScene(scene)
                 //TODO: create dev profile or remove on delivery
@@ -25,6 +24,8 @@ class GameViewController: UIViewController {
                 view.showsNodeCount = true
             }
         }
+
+        GameCenterHelper.helper.viewController = self
     }
 
     override var shouldAutorotate: Bool {