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

@jakearchibald, in your proposal, it looks like `p.then()` increments the refcount, but `Promise.resolve(p)` doesn't? And that promises start out with a 0 refcount, so that you don't have to also `abort()` the initial `fetch()`? This seems odd to me, although it gets around the need to expose GC.

Does any of this flow through to the `async`/`await` syntax, or do you have to manipulate the promises directly to use cancellation?

I'm also worried about subsequent uses of the original promise hanging instead of rejecting. 

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