Version bump in setup
Get Heroku to do a source install.

It's probably not the right thing to do, but it does mean that you
can change the code, push it, and see the changes without having to
remember to bump the version no all the time.
Fix issue #55.  Crawl now replaces activities.

Previously there would be lots of db constraint errors during a crawl
when we attempted to remove the activity objects related to a
resource. These have been removed by correcting the on delete cascade
behaviour of some foriegn keys.

Parse errors are now logged into the `Log` table in the database
which can be cleared out withe the new `cleanup` command.