Add python 3.5 and 3.6 to tox.ini
Add python 3.5 and 3.6 to tox.ini

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