Twenty Thirteen: remove fixed navbar. Closes #24184.

git-svn-id: http://core.svn.wordpress.org/trunk@24169 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add a 'quote_source_format' filter and make the default an em-dash and a space preceding the source.

fixes #24243

git-svn-id: http://core.svn.wordpress.org/trunk@24170 1a063a9b-81f0-0310-95a4-ce76da25c4cd
POT, generated from r24170

git-svn-id: http://core.svn.wordpress.org/trunk@24171 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: improve Quote post format styles to look more like quotes. Fixes #24176.

git-svn-id: http://core.svn.wordpress.org/trunk@24172 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions UI: Add a help tab. props siobhan, DrewAPicture. see #23899.

git-svn-id: http://core.svn.wordpress.org/trunk@24173 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions UI: Just another update - Now with improved tick marks and tooltips.

props adamsilverstein. see #23935.

git-svn-id: http://core.svn.wordpress.org/trunk@24174 1a063a9b-81f0-0310-95a4-ce76da25c4cd