[w3c/manifest] WIP: Rough draft of installation stuff (#453)

This is pretty rough still, but  might as well start getting feedback... 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/453

-- Commit Summary --

  * WIP (installation): Add install+prompt events (closes #417)
  * WIP
  * WIP
  * WIP: installation events and process

-- File Changes --

    M index.html (372)

-- Patch Links --

https://github.com/w3c/manifest/pull/453.patch
https://github.com/w3c/manifest/pull/453.diff

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