Fix incorrect position of HUD after roation on iPad.
Fix incorrect position of HUD after roation on iPad.

Observe UIApplicationDidChangeStatusBarFrameNotification instead of
UIDeviceOrientationDidChangeNotification for detecting screen rotation
since the later notification still gives the old bounds for
self.targetVew in our orientationChanged selector on iPad unless it
is called after a delay.

JonasGessner/JGProgressHUD,JonasGessner/JGProgressHUD