fix spaces vs tabs issue with dredd / delete todos after running tests

Tabs were breaking the apib file (my bad!), so I switched it back to our original format.

In a new afterAll hook, I'm getting all todos and deleting the ones we created -- the differentiator is the title: "dredd".

@proppy is there a better way to do any of these changes?
Oh, I see. I just went over this in ba38e27 - can you take a look if that will work?

The reason I went with the global in the first place was to handle the `hooks.afterAll` clean-up operation, which doesn't receive a `t` argument.