Re: [whatwg/url] Define hosts' public suffix and registrable domain. (#391)

@mikewest I think the main thing I need input on is the `appspot.com` / `github.io` question. To quote @sleevi above:

> From a spec question, what do you want this definition to entail for the `appspot.com` case?
>
> That is,
> - `foo.bar.appspot.com` is "obviously" going to return `bar.appspot.com` as the registerable domain (with `appspot.com` as the public suffix), and the same would be expected if just `bar.appspot.com`.
> - What do you expect this machinery to return for `appspot.com`? `appspot.com` is on the PSL, so that is a public suffix, but `appspot.com` is also a registerable domain under the `com` PSL.
>
> I seem to recall that different platform features interpret that differently (navigation vs cookies, for example)

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