[whatwg/fetch] {cache: "no-cache"} vs Cache-Control: immutable (#308)

Firefox 49 implemented a new extended attribute of the Cache-Control response header - immutable, it has not been standardized yet, see [this post](http://bitsup.blogspot.com/2016/05/cache-control-immutable.html) for the details.

So here is the conflict: should `fetch(aURLWithImmutableCache, {cache: "no-cache"})` send a conditional request first or use the cache directly without sending any request? Currently Firefox's behavior is the latter.

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