Pin django minor version and fix template bug

It looks like this bug surfaced after a minor version update, but it's
not clear. Rather than researching, I just fixed the bug. Pinning the version so things stay predicatable.
Always run syncdb and migrate

This may create problems for spinning up new servers (because the db
will have to be dropped and then reloaded from a .sql) but will simplify
periodic deployments.
Use ansible 'command' module not 'file' for dirs
Use more vars and reduce role var duplication
Merge pull request #302 from steventlamb/ops

Ops