Handling organizations

We use this to create an activity feed-type room. However, since we frequently create repos (usually within one or two github orgs), we have to remember to go in and re-configure the integration to add the repos we just created or forgot about.

Either a subscribe-to-org feature and/or a scriptable API (so I could write a script using the GitHub API and yours to figure out which ones need to be added and add them) would be appreciated.