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

@jyasskin @martinthomson 

> differ from @jakearchibald in thinking that cancellation should always result in either a resolved or rejected CancellablePromise

I'm not opposed to cancellation resulting in rejection, as long as you can tell a cancellation-rejection apart from other rejections.

```js
fetch(url).then(r => r.json()).catch(err => {
  if (!isCancellation) showErrorMessage();
  stopSpinner();
});
```

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