Revert to a lower version of tastypie.

The 0.12 line seems to drop compatibility with Django 1.5 + South, as
the migrations are no longer runnable without an import error. This is
because django.db.migrations doesn't exist (it's called from within the
initial migration)
Enable migrations during initial provisioning.
Merge fixes
Merge branch 'justinabrahms-vagrant--migrations'