[w3c/manifest] Use docURL as start_url (#991)

Closes #669
Closes #668 
Closes #670

This change (choose at least one, delete ones that don't apply):

* Adds new normative requirements

Implementation commitment (delete if not making normative changes):

* [X] WebKit - already implemented
* [X] Chromium - already implemented
* [X] Gecko - already implemented

Commit message:

Reflect that user agents are using the document's URL as the start URL. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/991

-- Commit Summary --

  * Use docURL as start_url

-- File Changes --

    M index.html (9)

-- Patch Links --

https://github.com/w3c/manifest/pull/991.patch
https://github.com/w3c/manifest/pull/991.diff

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https://github.com/w3c/manifest/pull/991