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

Another alternative:

```js
let abortFetch;
let p = new Promise((resolve, reject) => { abortFetch = reject; });
fetch(url, { abort: p }).then(success, failure);
// on error
abortFetch();
```

That would make the activity on fetch dependent on a previous promise in a similar fashion (but more intimate) to this:

```js
promiseYieldingThing().then(result => fetch(url)).then(success, failure);
```

I don't like the implicit nature of what @jakearchibald suggests here.

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