Mobile

Wow lots of stylesheet cleanup.

Highlights:

- variables.styl is looking nice
- mobile-friendly search page
- mobile-friendly home page
- hide stats on mobile home page
- lots of unused styles removed
- use variables for breakpoints
- pave the way for a more-than-one-breakpoint future

Screens:

![screen shot 2014-11-05 at 4 07 38 pm](https://cloud.githubusercontent.com/assets/2289/4928838/9e185e60-6549-11e4-9569-37eff98f04d3.png)

![screen shot 2014-11-05 at 4 07 51 pm](https://cloud.githubusercontent.com/assets/2289/4928839/a23966ec-6549-11e4-8263-66e9e3c5b545.png)

![screen shot 2014-11-05 at 4 08 08 pm](https://cloud.githubusercontent.com/assets/2289/4928842/a590dcda-6549-11e4-87df-3cd7d03deb8e.png)