[css3-ui] nav-<dir>: Add author and reviewer links

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extra : rebase_source : f134dbf82e73d52fe5a10cf76154a466d3c0c92f
[css3-ui] nav-<dir>: Make tests fail when property is not supported

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extra : rebase_source : 8bcbff155801097bc676e398d3846e45deade204
[css3-ui] nav-<dir>: Add instructions for known implementations in comments

--HG--
extra : rebase_source : 757cab3bade93e83ab45459d8e7ae278fe83ea5e