[permissions] Make Permissions.request() only take a single descriptor. (#72)

This matches the [current Chromium implementation](https://code.google.com/p/chromium/codesearch/#chromium/src/third_party/WebKit/Source/modules/permissions/Permissions.idl), which has a `requestAll()` function to handle a sequence of permissions. A sequence could also be handled with `Promise.all()`, like [`query()` suggests](https://rawgit.com/jyasskin/permissions/no-request-sequence/index.html#h-note1).
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/72

-- Commit Summary --

  * Run Tidy.
  * Fix ReSpec warnings.
  * Name the query, request, and revoke a permission algorithms.
  * Define the 'get a permission storage identifier' algorithm.
  * Make Permissions.request() only take a single descriptor.

-- File Changes --

    M index.html (166)

-- Patch Links --

https://github.com/w3c/permissions/pull/72.patch
https://github.com/w3c/permissions/pull/72.diff

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