[push-api] Rename hasPermission to permissionState (#142)

As agreed in https://github.com/w3c/push-api/issues/136
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/142

-- Commit Summary --

  * Rename hasPermission to permissionState.
  * change default to prompt
  * Rename hasPermission to permissionState.
  * Merge branch 'gh-pages' of https://github.com/miguelgarciaarribas/push-api into gh-pages
  * remove extra empty line

-- File Changes --

    M index.html (5)

-- Patch Links --

https://github.com/w3c/push-api/pull/142.patch
https://github.com/w3c/push-api/pull/142.diff

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https://github.com/w3c/push-api/pull/142