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

@jakearchibald It's up to the producer that receives a cancellation to call `reject` with a clear argument, but we should add a `CancelledError` to http://heycam.github.io/webidl/#idl-DOMException-error-names to give folks an easy thing to return. This _has_ to be up to the producer because it might not receive the cancellation in time to actually cancel, or it might have failed for a different reason and be cleaning up when the cancellation comes in.

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