Re: [w3c/manifest] start_url should not default to document URL (#669)

Discussed with @marcoscaceres and @dominickng : the new "document is installable" logic gives us a path forward on this:

1. If start_url is not supplied or invalid, just leave it as undefined (so there's no default).
2. Move the "start_url is same origin as document URL" check up to steps to determine installability of the document. If start_url is missing or not same origin as document URL, document is not installable.

Resolves #668 and #669.

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