[w3c/permissions] Define an algorithm to update the permission storage. (#91)

Preview at https://rawgit.com/jyasskin/permissions/update-permission/index.html#storage-manipulation.

This contributes to #33, #74, and #86, and fixes #84.

@annevk, how do you like the wording that would wind up in [[notifications]]?
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/91

-- Commit Summary --

  * Define an algorithm to update the permission storage.
  * Add shorthands for permissions with just `state` in their storage.

-- File Changes --

    M index.bs (200)
    M index.html (187)

-- Patch Links --

https://github.com/w3c/permissions/pull/91.patch
https://github.com/w3c/permissions/pull/91.diff

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