Post locks on the posts list screen: new icons for the lock, props empireoflight, show avatar for the user currently editing, props dh-shredder, see #23312

git-svn-id: http://core.svn.wordpress.org/trunk@23681 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-alpha-23682.

git-svn-id: http://core.svn.wordpress.org/trunk@23682 1a063a9b-81f0-0310-95a4-ce76da25c4cd