[Merge] lp:~barry/mailman/py3 into lp:mailman

Barry Warsaw has proposed merging lp:~barry/mailman/py3 into lp:mailman. Requested reviews: Mailman Coders (mailman-coders) For more details, see: https://code.launchpad.net/~barry/mailman/py3/+merge/245313 Ports Mailman 3 core to Python 3.4 -- Your team Mailman Coders is requested to review the proposed merge of lp:~barry/mailman/py3 into lp:mailman.