Revert "Update to use Django 1.7.5"
Revert "Update to use Django 1.7.5"

This reverts commit 96aff3f1ee882789cdce6908dcfd86ded93e847e.

crcollins/chemtools-webapp,crcollins/chemtools-webapp,crcollins/chemtools-webapp,crcollins/chemtools-webapp,crcollins/chemtools-webapp