fix(styles): Removing unneeded vendor prefixes
Merge pull request #606 from pdehaan/issue-471

fix(styles): Removing unneeded vendor prefixes

I manually checked to ensure the removed vendor prefixed styles made it into the resulting CSS, when needed. The only major difference is `-moz-boxshadow` is missing, but Firefox dropped the prefix starting with [version 4](http://caniuse.com/#feat=css-boxshadow).

A grep for remaining vendor prefixes yields nothing of interest, only media queries and browser specific fixes remain.

r+ Excellent @pdehaan!