Updated to the correct 1.0.5 from Zurb

Hi.

I noticed that the css in the gem (v 1.0.5) differed a bit from the 1.0.5 version currently in the original zurb repo. I've updated the css to the correct version. 

Original commit from zurb:
https://github.com/zurb/ink/commit/58ca5aea006649dad661879e34aee2344f348503