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

@jhusain kris argues this point here: https://github.com/kriskowal/gtor 

Also here is the similar discussion for [PromiseKit](https://github.com/mxcl/PromiseKit/issues/18#issuecomment-51493764) (Objective-C promises) - quoting @kriskowal :

> My position on cancellation has evolved. I am now convinced that cancellation is inherently impossible with the Promise abstraction because promises can multiple dependess and dependees can be introduced at any time. If any dependee cancels a promise, it would be able to interfere with future dependees. There are two ways to get around the problem. One is to introduce a separate cancellation "capability", perhaps passed as an argument. The other is to introduce a new abstraction, a perhaps thenable "Task", which in exchange for requiring that each task only have one observer (one then call, ever), can be canceled without fear of interference. Tasks would support a fork() method to create a new task, allowing another dependee to retain the task or postpone cancelation.

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