Make "load_fixtures.sh" able to run without error
Make "load_fixtures.sh" able to run without error

This is another step towards #579.  I am not sure why we have fixtures
that error out trying to create database rows that already exist, but
this disables them so that a basic site can now come up and running with
some content.

PyCon/pycon,PyCon/pycon,PyCon/pycon,PyCon/pycon