Twenty Fourteen: revamp the RTL stylesheet and related cleanup. Props iamtakashi, see #25801.
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Fall back to comment author email in get_avatar() if the user who left the comment no longer exists.

props mauryaratan, lite3.
fixes #25803.
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git-svn-id: http://core.svn.wordpress.org/trunk@25933 1a063a9b-81f0-0310-95a4-ce76da25c4cd