Xcode complains about integers in strings

Hi,

First of all thanks for this great lib!
I would like to mention, that Xcode reports 5 complains to me, saying that "Values of type NSInteger should not  be used". So I just fixed that, hope you will merge it and update the cocoa pods versions, the yellow marks at xcode are making me nervous. 
![image](http://i.imgur.com/qZo1L49.gif)

Thanks for your time,
Daniel