Upgrade Girder development package requirements
Upgrade Girder development package requirements

Coverage changes at:
http://coverage.readthedocs.io/en/coverage-4.1/changes.html#version-4-1b-2016-05-21

Flake8 changes at:
https://flake8.readthedocs.io/en/latest/changes.html

Flake8-Docstrings changes at:
https://gitlab.com/pycqa/flake8-docstrings/blob/master/HISTORY.rst

HTTMock changes at (raw form):
https://github.com/patrys/httmock/compare/1.2.4...1.2.5

Mock changes at:
https://mock.readthedocs.io/en/latest/changelog.html

Sphinx changes at:
http://www.sphinx-doc.org/en/stable/changes.html

virtualenv changes at:
https://virtualenv.pypa.io/en/latest/changes.html

data-exp-lab/girder,Xarthisius/girder,jbeezley/girder,sutartmelson/girder,sutartmelson/girder,manthey/girder,girder/girder,Kitware/girder,sutartmelson/girder,girder/girder,salamb/girder,data-exp-lab/girder,data-exp-lab/girder,girder/girder,adsorensen/girder,jbeezley/girder,RafaelPalomar/girder,kotfic/girder,data-exp-lab/girder,sutartmelson/girder,salamb/girder,RafaelPalomar/girder,salamb/girder,adsorensen/girder,sutartmelson/girder,jbeezley/girder,adsorensen/girder,adsorensen/girder,kotfic/girder,kotfic/girder,Kitware/girder,kotfic/girder,girder/girder,Kitware/girder,data-exp-lab/girder,salamb/girder,RafaelPalomar/girder,adsorensen/girder,jbeezley/girder,RafaelPalomar/girder,Xarthisius/girder,Xarthisius/girder,manthey/girder,kotfic/girder,Xarthisius/girder,manthey/girder,Kitware/girder,Xarthisius/girder,manthey/girder,salamb/girder,RafaelPalomar/girder