Attempt to fix #59, status bar height is not hard-coded anymore, but derived from topLayoutGuide.length

[tobihagemann]

Not sure about this one. Well at least it works in my opinion, but I still don't understand that comment about that "workaround".

I could've just used viewController.topLayoutGuide, but I considered this: http://stackoverflow.com/a/21541533/1759462, because it should also work with nested child view controllers.

So what's that all about? contentSize of UITableViewController being rendered with {0, 0}. Do you have any test cases?

I've also changed the example project to a Universal App, so that you can see that the modal presentation also works properly.