Experiment: YAML based pages; moar refined HTML

This is just an experiment, but the idea would be to define the content
in a more structured way so that we can do more than basic Markdown ->
HTML.

The example presented here takes your instructions and turns 'em into a
(I think) pretty timeline.

![screenshot 2014-04-01 21 43 09](https://cloud.githubusercontent.com/assets/14482/2587489/8f1044ba-ba21-11e3-94f6-9d361d1df40c.png)