Bug 1009605 - Feedback should be sent to the task owner

You don't have to do this in this PR but the way you're getting the hostname is a bit odd -- playdoh provides functionality for this, if you set SITE_URL in settings and then `from funfactory.utils import absolutify` and absolutify any url to prepend the site host. See: https://github.com/mozilla/affiliates/blob/master/affiliates/settings/local.py-dist#L62

I'm honestly kinda surprised to even see a playdoh site running without SITE_URL at all, I thought it was used rather extensively in funfactory code.