Include getting dependencies for goworker in rake task
wip for posterity - Make integration tests quieter

Strangely, redirecting stderr and stdout to /dev/null causes errors on
consecutive rake runs. Somehow the goworker (or something) isn't
releasing its connection to the database, thereby preventing rake from
dropping or creating the test db

Keeping this commit around to document a potential pitfall.
Fix db connection leak in test suite

Clean up shared db connection in goworker, using a channel provided by
a (forked) goworker project, which blocks until the goworker is supposed
to exit.

Make the goworker spec helper a bit nicer, using Process.spawn to handle
some of the redirection.