WorldBank-Transport/open-transit-indicators — pull request #603 by moradology (2014-12-23 18:00:38+00:00)
Title: Add optional param for units on oti-legend

Note km in the bottom right:
![screen shot 2014-12-23 at 1 00 08 pm 2](https://cloud.githubusercontent.com/assets/1977405/5541256/a8e8b9a0-8aa3-11e4-8fd4-e8c0c924dc3c.png)