Fix text overflowing issues in column pattern on some versions of WebKit

- Update Guss dependencies to latest versions
- Now using CSS column fallbacks (using floats) to avoid this text overflowing bug:

![image](https://cloud.githubusercontent.com/assets/85783/3186116/27b77546-ec9d-11e3-9a22-3c935a73a6f9.png)

![image](https://cloud.githubusercontent.com/assets/85783/3186117/2d65536e-ec9d-11e3-8a5a-8c815010fefd.png)


![ ](http://gifs.joelglovier.com/visuals/sparklers.gif)