Housekeeping

Some general cleanup. Goals:
* Have tests passing out of the gate (provide .env.test)
* Remove unneeded files/folders/gems/routes
* Upgrade Ruby (2.1.5), Rails (4.1.8)
* Make Gemfile more readable

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AC & CT
Yes, there's no `convert_controller` any more. It's just `jobs#create` to convert docs.

-- CT