cocos2d protrait for both ios5 and 6

cocos2d-portrait-5and6.mm

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
  return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}

//and

if ([[UIDevice currentDevice].systemVersion floatValue] < 6.0) {
  // warning: addSubView doesn't work on iOS6
  [window_ addSubview:navController_.view];
}
else {
  // use this mehod on ios6
  [window_ setRootViewController:navController_];
}