Turn on edge anti-aliasing in iOS 7.0 and later:
The edges of rotated views will now be smoother.
See http://confusatory.org/post/78059850721/easy-antialiased-calayer-edges-on-ios-7-0-and-later for more info.
Merge pull request #26 from cbowns/master

Turn on edge anti-aliasing in iOS 7.0 and later