[w3c/ServiceWorker] Define procedure to convert options object of `sw.register()` to `Link` header (#979)

With the [recent comment](https://github.com/w3c/ServiceWorker/issues/893#issuecomment-248252956) in #893, we have to keep in mind that all the options that `navigator.serviceWorker.register` accepts need to be available to the `Link` header (and the `<link rel=serviceworker>` as well. With foreign fetch, this becomes especially important.

It would probably be good to define a procedure to convert the options object to a string-based representation. Additionally, we should limit the types of options that can be added in the future.

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