Re: [w3c/manifest] Change the default value for start_url (#670)

Hi Jeff,

When you say the "app package name", do you mean that's the unique identifier for the app? This spec doesn't really have an opinion about what is the "unique key" for the app (though maybe it should). This proposal is more about just what is the `start_url` (i.e., what page opens when you launch the app).

**Aside**: I think the best thing to use as a "unique key" is the manifest URL itself, not the start URL or origin. While it's unlikely that two apps will share the same start URL, they can. And it's certainly possible for two apps to have the same origin (e.g., all apps for a single user under github.io). I don't think you should be using the origin when the `start_url` is relative to the manifest.

I guess pertinent to this PR, what is the default page that you open for sites that have no `start_url` in their manifest? Is it just the top-level "/" page of the site? Note that this proposal is changing it to be the parent directory of the manifest, which doesn't sound exactly like what you do. Happy to work out a different default, but the proposed one makes the most sense since all URLs in the Manifest spec are resolved relative to the Manifest URL.

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