edx/opaque-keys — pull request #43 by dmitchell (2014-10-14 20:48:39+00:00)
Title: Parse the short-lived slashes and locations syntax

which solutions bravely picked up

@mattdrayer @doctoryes please review (and matt test on his stuff)

Matt, do I need to patch Aspen or will you just change your requirements.txt files to use this?
@nedbat ^^