[whatwg/fetch] Ability to configure default Headers (#271)

For many systems *all* requests require certain headers, either for authorization, load balancer selection in testing scenarios, or CSRF protection schemes. Having to pass headers explicitly with every individual call to `fetch()` makes this difficult, especially compared to the ability to inject them into every call of `$.ajax()` that a lot of projects may be moving to `fetch()` from.

I'd like to suggest configuring some API to configure default headers that would be used for all future `fetch()` calls in the session. Maybe an object at `fetch.headers` which could be used as a default set of headers to extend by the `headers` parameter to each `fetch()` call?

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