ckan/ckan — pull request #2075 by brew (2014-11-21 10:19:38+00:00)
Title: Upgrade zope.interfaces to 4.1.1

I don't think it makes any practical difference, but repoze.who 2.0 requires 4.1.1 (master is currently on 4.0.1). Pypi has the changelog here: https://pypi.python.org/pypi/zope.interface/4.1.1