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

@jyasskin 

```js
function myTransform(yourPromise) {
  return yourPromise
    .then(value => transform(value))
    .then(value => transform2(value));
}

myTransform(fetch(url)).cancel();
```

This would:

1. Cancel the promise returned by `.then(value => transform2(value))`
2. Cancel the promise returned by `.then(value => transform(value))` because all its child promises cancelled
3. Cancel `yourPromise` (which is `fetch(url)`) because all its child promises cancelled

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https://github.com/whatwg/fetch/issues/27#issuecomment-86946550