Renamed default user in database

This completes 9fad646bb, which only changed it in the scripts.

We should probably try to remove the databases from the repository
later on (and use manage.py syncdb|migrate instead).  In regards to
the authentication this probably means we'd have to add support
for multiple users/permissions first.
Fix DB router when running manage.py syncdb

While removing the default DBs might not be a good idea yet this at
least allows running manage.py syncdb.