Twenty Twelve: update post author comment markup and styles, improving hCard data parsing and simplifying styles. Fixes #23128. 

git-svn-id: http://core.svn.wordpress.org/trunk@23716 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Twelve: improve Appearance > Header styles to match front end view better -- including loading special Google Font there. Props obenland, fixes #23790.

git-svn-id: http://core.svn.wordpress.org/trunk@23717 1a063a9b-81f0-0310-95a4-ce76da25c4cd