Update gitbuster to 2.1b8
Update django-guardian to 1.1.1
Update commando to 0.3.4
Update vulture to 0.4
Update restview to 2.0.1

pygments is now always required
Update py-bcrypt to 0.3
Update taskw to 0.6.0
Update fabtools to 0.14.0
Update plumbum to 1.2.0
Update Unipath to 1.0

with Python 3 support