Force install of six and requests
Force install of six and requests

On old distros such as Ubuntu 14.04 pip now complains that the
it can't uninstall six or requests as they were install with
distutils. Use the -I option to force reinstall.

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