Add file header to post-formats.php. props DrewAPicture. fixes #24349.

git-svn-id: https://core.svn.wordpress.org/trunk@24267 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Heartbeat: don't connect when a response is not expected by any script (nothing to send), remove debug logging, clean up code formatting, see #23216

git-svn-id: https://core.svn.wordpress.org/trunk@24268 1a063a9b-81f0-0310-95a4-ce76da25c4cd