Re: [fetch] Aborting a fetch (#27)

@jakearchibald really nice example :+1: 

Still, aborting the request before the headers arrive is a valid use case. I think even just putting an `.abort` on a `Request` and having abort semantics (rather than disinterest) and throwing an `AbortedError` could solve it for 99% of users.

Personally, I'd love to see sound disinterest cancellation semantics on promises - and they'be been working out really well for bluebird. The problem is that it is _a lot_ of work to do. 

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