Icons

# Changes
 - More art! :art: Added special styling to first navigation item.
 - Added Autoprefixer to Sass build! Excellent!

/cc @weerd 

# Screenshot
![screen shot 2014-11-14 at 5 10 58 pm](https://cloud.githubusercontent.com/assets/583202/5054319/416e5528-6c21-11e4-952f-a95dd0797661.png)


Is this supposed to support IE8? Cause I don't think `:first-of-type` is IE8 compatible...? Not sure what the browser support on this is ![](https://dujrsrsgsd3nh.cloudfront.net/img/emoticons/shrug-1414032234@2x.png)