Revert back to default logging configuration.

Somehow, with the explicit config, no emails where sent to ADMINS on
500 errors. 'll have to check that out later...
Fixed deprecation warning in url confs.
Fixed list-by-categories and list-by-locations.

Subclassed the generic list view and changed the urls config accordingly. This
is only a quick fix to get rid of a 500 error. In the long run, these views
need to become more useful or get gone.