Layout help pages

Give the research, style guide, api and license page the coloured header style and where appropriate add page layout (api page stays wide).

This could be done a lot DRY'r in the future with a special layout for basic text pages.

![screen shot 2014-10-18 at 5 37 38 pm](https://cloud.githubusercontent.com/assets/1239550/4688773/4cf8a93e-5691-11e4-8ccb-5d1e8e312e63.png)
![screen shot 2014-10-18 at 5 37 31 pm](https://cloud.githubusercontent.com/assets/1239550/4688772/4cf72e60-5691-11e4-8f2e-bea31f40387c.png)
![screen shot 2014-10-18 at 5 37 22 pm](https://cloud.githubusercontent.com/assets/1239550/4688774/4cfdccd4-5691-11e4-9455-4fd3aa21b382.png)
![screen shot 2014-10-18 at 5 36 47 pm](https://cloud.githubusercontent.com/assets/1239550/4688775/4cff5f4a-5691-11e4-9ae8-b6594b820427.png)

closes #803