Add new styles and theme.

So the current site is kind of boring. I am trying to make it better!

What needs to happen:

- [ ] Pick a color scheme & implement it
- [ ] Create new logo (not sure who is handling this yet :smiley_cat:)
- [ ] Style the site to be consistent (buttons, spacing, typefaces)

Here is what this PR looks like (will update the screenshot as it gets updated):

![burlington ruby conference 2014](https://f.cloud.github.com/assets/928367/1837179/e029c3e0-7420-11e3-9654-c4de9ca95a56.png)