Re: [fetch] Initializing context/content specific fetch defaults (#43)

@igrigorik SW only has access to `fetch()` to retrieve resources. So if you use SW, `<link rel=preload>` will invoke `fetch()` at which point we need to have this solved for `fetch()`.

`context` is used for CSP/MIX/X-Content-Type-Options. Per this bug we'll start using it for request headers. Transport priorities is still unclear as they can depend on many things (e.g. whether an element is in the viewport).

Anyway, `context` is everything `fetch()` is capable of within the network layer (the Fetch Standard). So in that respect `as` seems strictly equal as it has no access outside the network layer either.

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