helpers after objects seems to work nicer (for me at least)

Hello, I am quite new to both compass and github (and thus to inuit, actually), I hope I am not bothering you with such a little change request. I only modified the template.

Importing helpers before objects made the grid items "loose" their width (they stayed with width: 100%, instead of taking the width from their other classes such as "one-half" and so on).

I also changed the index.html to reflect the change from grid-wrapper to grid and grid to grid__item.

Hope this helps future new users like myself.

Regards