Reorder footer, add social icons

@jospoortvliet Let me know what you think. I'm not sure it's quite right. Try with different screen widths too.

For people without the dev env (why not!):

![screen shot 2014-06-27 at 00 17 44](https://cloud.githubusercontent.com/assets/660805/3406095/2295858e-fd88-11e3-98f5-37df5cfd3917.png)

And 'interact' is not the right word....