Small face-lift and social additions

I've changed the icons a bit and added the Slack link. I've also face-lifted the fonts, spacings / paddings / etc a bit to be more symmetrical. If you like the change I will continue.

Addresses #19 and #6 

![screen shot 2014-11-10 at 7 07 10 pm](https://cloud.githubusercontent.com/assets/6686356/4981864/3c733cf8-690d-11e4-9e54-fe960c7c05fc.png)