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?
The global is defined in `index.js` to match the provided||default `serverUrl`.