Fix Orientation

It looks github can not create a branch from history. So I re-folks, and pull request.

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Make the orientation of LNNotificationBannerWindow changed base on
statusBarOrientation
Sometimes, I hope the UIViewController force landscape or portrait. When trigger
the LNNotification, it maybe portrait or landscape base on device. The
LNNotification's Orientation is different with the UIViewController. If
the LNNotification's Orientation is the same with the statusbar, the
problem can be solved. 
If the statusbar is hidden, the statusbar's orientation is still valid. The UIViewController' UI is also OK.

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How to recurrence

Add the following code to LNNotificationsUIDemo/ViewController.m, in order to force ViewController Portrait.  The problem will happen when the device's orientation changed.

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
	return UIInterfaceOrientationPortrait;
}

- (BOOL)shouldAutorotate
{
	return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
	return UIInterfaceOrientationMaskPortrait;
}