Used SVGO to reduce SVG file sizes, and removed unused code

Used SVGO (https://github.com/svg/svgo) to optimize the SVGs we are using, and remove unused code. There's room for a little more optimisation (10% more perhaps) but this step optimised each file 50-60%. See usage and results in screenshot below.

![screen shot 2014-10-14 at 11 12 59](https://cloud.githubusercontent.com/assets/2903904/4627524/0c5436c6-538c-11e4-8410-596e93fc3779.png)