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

answering @getify from my POV:

```js
var parent = new Promise(function (res, rej, cancel) {
    var cancelable = setTimeout(res,100);
    cancel(function () {
      clearTimeout(cancelable);
    });
  }),
  child1 = parent.then(function(){ console.log("child1"); }),
  child2 = parent.then(function(){ console.log("child2"); });
```
Since you expose cancel-ability, you setup what should happen when you cancel so that `parent.cancel()` will trigger its internal cancellation state.

Now, as quantum physics tough us that the world is not just black or white, we also need a canceled state ( IMO™ ) as a way to ignore or react.

Let's be more pragmatic, as Jake suggested already before ;-)

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