Upgrade Girder, Minerva, Romanesco common requirements
Upgrade Girder, Minerva, Romanesco common requirements

Fixes #194.

amqp changes at (not up to date):
https://github.com/celery/py-amqp/blob/master/Changelog

Billiard changes at (not up to date):
https://github.com/celery/billiard/blob/master/CHANGES.txt

Kombu changes at:
http://docs.celeryproject.org/projects/kombu/en/latest/changelog.html

Pillow changes at:
https://pillow.readthedocs.org/en/3.1.x/releasenotes/3.1.0.html

PyMongo changes at:
https://api.mongodb.org/python/current/changelog.html

pytz changes at (not up to date):
https://launchpad.net/pytz/+announcements

Requests changes at:
http://docs.python-requests.org/en/latest/community/updates/#release-and-version-history

Six changes at:
https://bitbucket.org/gutworth/six/src/1991f8b5b654f077e773f05695a08e0506b7367f/CHANGES

Kitware/romanesco,girder/girder_worker,girder/girder_worker,Kitware/romanesco,girder/girder_worker,Kitware/romanesco,Kitware/romanesco