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

Okay, as this goes no where, can we have at least this simple version for **now**, so, for example, polyfills could implement it?
```javascript
fetch('url', function(abort) {
  outerAbort = abort;
});
```
And just do not care about ref-count, etc. Cancel request associated with that fetch and just never resolve promise associated with that request. If promise already resolve, then, just do nothing, as abort works on xhr.

@jakearchibald @WebReflection @annevk  does anyone has serious arguments against it?

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