scipy/scipy — pull request #2507 by rgommers (2013-05-20 13:18:53+00:00)
Title: MAINT: stats: alias the erlang to the gamma distribution.  Add gamma._sf...

...().

Closes gh-2172 and gh-198. See discussion on gh-2172 for details.

Most people seemed to be in favor of making erlang an alias, so I went with that.