Remove legacy db table.

Was causing problems for logs, as this model didn't provide a
get_absolete_url method, required for display of the LogEntry table.

Change-Id: I5269ce135b0a10c89418bee41327ff5abd0cd4ce
Fix migration error.

Content types aren't created until after the migrations are complete, it
sems, so we need to cope if the projects content type hasn't been
created yet.

Change-Id: Ie9bceeef4b2f736f448ae628c787f43d09a58d3d