WIP: Switched to real Resque and fakeredis.

[justinweiss]

It didn't make sense to copy / rewrite all of Resque, just to add some assertions to it. Instead, I'm using fakeredis and actual Resque. That way, all the persistence happens in-memory (so you don't need to run Redis yourself), and I can take advantage of the built-in methods Resque has for looking through queues and running jobs. This should be way more reliable and easy to maintain.

Todo:

• [ ] Get scheduler assertions working
• [ ] Update the README