Bug: capistrano didn't update the crontab during deployment. As a result
the crontab still referenced an old deployment. Eventually that
deployment was deleted and cronjobs started silently failing.
Broken in 223e5f1e8. Turns out that `whenever` defaults to running on
servers with the `db` role. Removing kagamihara from the db role meant
that whenever was no longer configured to run anywhere.
804ccd4fcc