Unicorn and Flash Message Fixes

Two small fixes, one addresses a minor issue where we're outputting a raw object in a flash message and the second surrounds restarting Unicorn. Currently we're trying to reload Unicorn with `-HUP` which should gracefully reload the workers with the new code that is pushed but this doesn't seem to be happening so this changes it back to just kill the Unicorn process and start it back up. We should come back to look at this when we implement runit but we should get this resolved quickly as it's causing some issues on staging.