Twenty Thirteen: better contrast for footer text and form "allowed tags" text, props sabreuse. See #23513.

git-svn-id: https://core.svn.wordpress.org/trunk@23613 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: better contrast for page links, props sabreuse. See #23513.

git-svn-id: https://core.svn.wordpress.org/trunk@23614 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Prevent an unseemly gap on the edit screen when nothing else displays before normal meta boxes. Give better HTML and visual structure to items added via `edit_form_after_title` and `edit_form_after_editor`. Using a class of `.edit-form-section` will now get you a 20px bottom margin; perfect for your additions to the post edit screen. fixes #23240.


git-svn-id: https://core.svn.wordpress.org/trunk@23615 1a063a9b-81f0-0310-95a4-ce76da25c4cd