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?
Yes, but you could also call dredd from the CLI (i.e: for langs != js).

`dredd todos.apib http://localhost:5000 --hookfiles=hooks.js`

Filed #3 as a reminder for me not to forget about documenting this.