Rationalize layout

Switches us to a percentage-based layout. Removes a lot of resolution-dependent edge cases. Also expands the map in the deep dive to fill the whole right column:

![screen shot 2014-11-02 at 10 18 05 am](https://cloud.githubusercontent.com/assets/86435/4875712/3087ed36-62a4-11e4-93ce-829fe8a6c09c.png)