wrote failing testing behavior of Scrum#videos_by

Try these old gem versions again. Maybe you just need to reboot your computer?

I see you started a `Scrum` model to back the `ScrumController`. I think that's a good idea. I don't think it will inherit from `ActiveRecord::Base` though. We inherit from that when we want our models persisted in the database. What we have here is a model that will contain the business logic to talk to Youtube through the `YoutubeIt` gem.

I wrote a very loose spec for the `#query_by` method that we will need on `Scrum`. The spec is only testing for the desired behavior, the implementation details are up to you.