Re: [fetch] Add timeout option (#20)

@danostrowski How to abort a request is relatively straight forward. (Or at least outside the scope of this issue).

Unfortunately, it seems we're blocked on figuring out a way to expose this feature. E.g. do we add an `.abort()` method to the Promise returned by `fetch()`? And how does this interact with other promises after calling `.then()`. See whatwg/fetch#27.

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