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

@riking I don't fully understand the aim of your code. I'd handle long-polling like this:

```js
function poll(url, handleResult) {
  return fetch(url)
    .then(handleResult)
    .then(poll, () => wait(1000).then(poll));
}

var poll = poll(url, cb);

// later...
poll.cancel();
```

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