Make SVG icons scalable on root text resize

Majority of our users have browsers that support SVG. Let's give them the opportunity to enjoy our beautiful icons at scale when they resize the text of their browser :)

## Before

![screen shot 2014-07-29 at 11 40 04](https://cloud.githubusercontent.com/assets/85783/3733866/3be28be2-170d-11e4-9b14-240a02074d99.PNG)


![screen shot 2014-07-29 at 11 40 08](https://cloud.githubusercontent.com/assets/85783/3733865/372e6c6a-170d-11e4-9b02-c79970659c8d.PNG)


![screen shot 2014-07-29 at 11 42 40](https://cloud.githubusercontent.com/assets/85783/3733863/33c2d9e4-170d-11e4-9e0e-ee9560bb6517.PNG)


## After (text set as "very large" in Chrome)

![screen shot 2014-07-29 at 11 39 46](https://cloud.githubusercontent.com/assets/85783/3733869/431f2a5a-170d-11e4-868f-11cdba4627e8.PNG)

![screen shot 2014-07-29 at 11 41 31](https://cloud.githubusercontent.com/assets/85783/3733873/46c4a1f8-170d-11e4-8238-af7d684f1479.PNG)

![screen shot 2014-07-29 at 11 42 34](https://cloud.githubusercontent.com/assets/85783/3733861/2e70977e-170d-11e4-88c6-1a3b8b672d3a.PNG)

![ ](http://media.giphy.com/media/kEGjBPCRhrBZe/giphy.gif)