Attempting new layout, but doesn't work

Aborted because the layout doesn't work. Issues:

- Alignment of the settings box doesn't work across panels
- Would require dropdown for "more" in JS section as we have so many
- Language selection is done once, and so shouldn't be given so much visual priority
- Wanted to add "show line numbers" but then this would repeat in the boxes, or show and vanish from others
- Plus additional issues with inserting an element *inside* the codemirror object

Sample of how it looked in this branch:

![screen shot 2014-03-02 at 15 42 26](https://f.cloud.github.com/assets/13700/2304503/c3450918-a221-11e3-9f01-ef8801162e9b.png)

@dannyhope cc'ing you as a heads up.