Cleaning up ansible playbooks to work with postgis

PostGIS setup has always been rough with the ansible playbooks from my
outline django project. I went through and cleaned them up and the
vagrant provisioning now works right out of the box! No promises that it
works when provisioning a VPS, however.
Whole bunch of misc updates to make provisioning work

Our settings and requirements had gotten all out of whack. This updates
things so the app runs on a first pass. There will likely still need to
be some cleanup as a result of these changes.
Merge branch 'master' of github.com:code4maine/volunteer-coordination