mapbox/tm2 — pull request #300 by samanpwbb (2014-04-14 22:12:21+00:00)
Title: explain baselayer id input

Explains what this is:

![screen shot 2014-04-14 at 6 11 58 pm](https://cloud.githubusercontent.com/assets/108094/2701470/d4edab6c-c421-11e3-92ec-8443e72aa634.png)