iOS 7.1 changed the behavior for setting the title on disabled buttons.
Merge pull request #54 from square/puls/fix-ios-71

iOS 7.1 changed the behavior for setting the title on disabled buttons.
Fix not-this-month buttons on iOS 7.
Merge pull request #56 from square/puls/fix-not-this-month

Fix not-this-month buttons on iOS 7.
Merge branch 'master' of https://github.com/square/objc-TimesSquare