Twenty Fourteen: implement tag auto-complete for featured content settings, and uppercase `__CLASS__` for consistency. Props kovshenin, see #25549.
Built from https://develop.svn.wordpress.org/trunk@25813


git-svn-id: http://core.svn.wordpress.org/trunk@25725 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: cleanup, props iamtakashi. Fixes #25613.

 * With the ephemera widget in place, `content-recent-formatted-post.php` is unused, see #25028.
* We're no longe filtering formatted posts from the main query, see #25330.
 * Fix a typo.
Built from https://develop.svn.wordpress.org/trunk@25814


git-svn-id: http://core.svn.wordpress.org/trunk@25726 1a063a9b-81f0-0310-95a4-ce76da25c4cd