add sub-sections to nav bar for additional tools

pretty sure this was a deliberate style choice so I expect this to be closed as won't merge but decided I'd throw it out there anyway because it also fixes linking to the hashes in the sub-sections

Here's what it looks like:
![puppet submenu](https://cloud.githubusercontent.com/assets/1551593/3787686/84ac7212-1a2c-11e4-963a-7c49921904f4.png)
(Ignore the missing icons, fa isn't working locally for some reason)