[w3c/manifest] Remove the default value for start_url (#670)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/670

-- Commit Summary --

  * start_url default is undefined, not document URL.
  * Added start_url to all examples.
  * Added an issue.

-- File Changes --

    M index.html (37)

-- Patch Links --

https://github.com/w3c/manifest/pull/670.patch
https://github.com/w3c/manifest/pull/670.diff

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