Refactor Quebert controllers response to method calls instead of raise from the job.

[bradgessler]

Quebert jobs raise classes that are caught by Quebert controllers to manage job life-cycles. Refactor jobs to call methods on the controller. e.g. job.retry could call controller.retry(job) if the retry method is present on the controller (or have a base controller that doesn't perform an operation on a retry).

All of the exceptions implemented at https://github.com/polleverywhere/quebert/blob/multiple-tubes/lib/quebert/job.rb#L24-33 should be moved into a controller. Then methods like https://github.com/polleverywhere/quebert/blob/multiple-tubes/lib/quebert/job.rb#L94-105 can be delegated to said controller to deal with all job concerns in relation to the backend.