Handle repos with inadequate information

* Inactivate repositories which lack privacy or org information
* Add rake task to update repo information

https://trello.com/c/oPFtmreZ/393-builds-are-being-run-for-active-repos-missing-privacy-and-organization-information
There's already a job for this in `lib/tasks/repo.rake`. Can we use that, or tweak it?