Twenty Thirteen: style the the "Login to Reply" link correctly, props obenland. Fixes #23943.

git-svn-id: http://core.svn.wordpress.org/trunk@23920 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Third parameter for shortcode_atts() for audio and video shortcodes. props obenland, see #23282.



git-svn-id: http://core.svn.wordpress.org/trunk@23921 1a063a9b-81f0-0310-95a4-ce76da25c4cd