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

Ok, so I've played with @WebReflection 's proposal for a while now (forever pending) and its semantics are actually pretty nice in demo code I've written. I still find it problematic from a conceptual point of view but ignoring the value (signalling we are disinterested in it) which lets it clean up worked well for what I tried in practice (autocomplete like, aborting requests etc).

While I'm still uneasy with the conceptual level, from a pragmatic PoV I'm in favour of it - the semantics [here](https://github.com/petkaantonov/bluebird/issues/415#issuecomment-73242358) are also pretty good minus the uncatchability. 

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