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

If you cancel you don't expect anything because you canceled. Going through `reject` what are you going to expect or why would even set at all that `.then` ?

Agreed about the catch concern, which is why I went for a silent cancelation.

If you cancel, whoever was interesting in the promise result will never be executed (but all Promises resolved regardless, no side-effect there, that's the goal of my design)

Who canceled, could still do something with that promise, if needed, just to follow the pattern, not because it will exect a value.

**However** in my initial design `.cancel(why)` was working as resolution for the promise, so that you can eventually cancel with a reason that will be passed to the next `.then` that is not in the canceled chain, but in the waiting one. Still not sure how much sense it makes.

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