Add style for .legislative-list

For lists that, semantically speaking, are ordered, but have contents that appear in legislation so must have user defined numbering systems.

![screen shot 2014-06-13 at 16 27 57](https://cloud.githubusercontent.com/assets/68009/3271691/6a697cf4-f30f-11e3-8e56-72f1a78ab59c.png)

Gist: https://gist.github.com/evilstreak/7097e6f0cd6b4a93d996
Trellos: 
https://trello.com/c/ZcadzeuM/127-manuals-add-multiple-levels-of-indentation-1
https://trello.com/c/lgFFfydK/59-manuals-alignment-for-manuals-disable-normal-list-markdown-3