OMG! It's rubocop! And he's walking with a cane!
Obey the cane!
Rubocop says toe the line!

I've chosen to enforce the rules on our specs as well as prod code.

The only real consequence of this is our specs now prefer to be of the
form

```
describe M:N:C do
end
```

as opposed to

```
module M
  module N
    describe C do
    end
  end
end
```

I actually sorta like this style better anyway.  The only downside is
we must qualifiy references to `C`, or else use the handy
`described_class` method that rpsec provides.