[w3c/permissions] Linked testing policy and fixed a few links (#164)

per
https://www.w3.org/2017/11/06-webappsec-minutes.html#item16
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/164

-- Commit Summary --

  * Linked testing policy and fixed a few links

-- File Changes --

    M CONTRIBUTING.md (7)

-- Patch Links --

https://github.com/w3c/permissions/pull/164.patch
https://github.com/w3c/permissions/pull/164.diff

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