Need to handle repository rename event

[vsoch]

In the case that a repository is renamed, we need to make sure the metadata is updated on the server:

https://developer.github.com/v3/activity/events/types/#repositoryevent

The previous owner is added as a contributor and all previous webhooks are maintained, so it shouldn't be an issue to do the transfer. In the case that the repo is archived or deleted, then we would want to archive the repository and prevent future edits.

[vsoch]

This is also done.