Fixes #310 - forceOrientationUpdate and iOS 8

When testing on iOS 8, the forced orientation update sometimes fails with the following error:

```
Trying to dismiss the presentation controller while transitioning already. (<_UIFullscreenPresentationController: 0x7f87fdb0d720>)
transitionViewForCurrentTransition is not set, presentation controller was dismissed during the presentation? (<_UIFullscreenPresentationController:
```