github/developer.github.com — pull request #424 by arfon (2014-02-06 01:51:27+00:00)
Title: Adding information about how to compare forks

@pengwynn - not sure I'm really describing this request:

`https://api.github.com/repos/arfon/astropy/compare/astropy:master...master`

syntactically properly here. Thoughts?