jQuery 1.9.1 and jQuery Migrate 1.1.0.

Remains uncompressed for now, until we work out all 1.9.x issues.
Fixes custom fields.

props ocean90, wonderboymusic. see #22975.



git-svn-id: http://core.svn.wordpress.org/trunk@23421 1a063a9b-81f0-0310-95a4-ce76da25c4cd