Make Camille do her own github integration/announcements

[aranasaurus]

Currently we have a separate Slack github integration set up for announcing activity in this repo. It occurred to me that there's probably a hubot script that does this that would be super simple to set up and then Camille can just do it herself and we wouldn't have to use up a valuable Slack integration for it.

[IanKeen]

yep, because we have a full webserver running we can do anything with webhooks!