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

doing fetch with just one function is difficult to expand with adding api in future.
(anti Open-Closed Principle)

in current interface, we do all thing with 
- adding new props to option arguments
- adding new methods to returned promise

the problem is current `fetch()` is a high level api.
but I believe we need a low level api for fetching
what has capability for building XHR or kind of high-level api on top of it.

I heard that chrome are going to export fetch to window in M42 (mid April)
If that happens, it became hard to change fetch interface.
I think we need to discuss more about current api while we have a chance to change api.

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https://github.com/whatwg/fetch/issues/20#issuecomment-76130872