Add wp-util.min.js. See #24424.



git-svn-id: https://core.svn.wordpress.org/trunk@24374 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta3-24375.

git-svn-id: https://core.svn.wordpress.org/trunk@24375 1a063a9b-81f0-0310-95a4-ce76da25c4cd