status bar style support added

[carguezu]

Now you can change or hide the initial status bar style

@property (nonatomic) UIStatusBarStyle statusbarStyle;
@property(nonatomic, getter=isStatusBarHidden) BOOL statusBarHidden;

Or change it or hide it individually from each of your child controllers by adding one of these two methods

- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}

-(BOOL) prefersStatusBarHidden {
    return YES;
}

Note: we are assuming that your "View controller-based status bar appearance" in your info.plist is set to YES