[manifest] Made using fallbacks normative (closes #350) (#351)

* Deriving metadata from the manifest's owner Document is now a normative recommendation. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/351

-- Commit Summary --

  * Made using fallbacks normative (closes #350)

-- File Changes --

    M index.html (49)

-- Patch Links --

https://github.com/w3c/manifest/pull/351.patch
https://github.com/w3c/manifest/pull/351.diff

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https://github.com/w3c/manifest/pull/351