Adjustments for iOS 7 View Controller with automaticallyAdjustsScrollViewInsets

If View Controller has automaticallyAdjustsScrollViewInsets set to YES
and its view is a UIScrollView then no need to add topLayoutGuide length.
Merge pull request #16 from ashchan/top-position-fix

Adjustments for iOS 7 View Controller with automaticallyAdjustsScrollVie...