Tweak coaches page

- Uses a table instead of a list (again)
- Tweaks buttons to use glyphicons
- Orders coaches by surname

![screen shot 2013-08-25 at 13 20 28](https://f.cloud.github.com/assets/736291/1022346/d2864c88-0d80-11e3-9479-947e5f25939f.png)