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
I think it's fine to tweak that task. I think it makes more sense to be run without `AND updated_at IS NULL` anyway.