Introduce new theme customizer to replace theme preview. Rough first pass. props koopersmith, ocean90. see #19910.
Merges in http://plugins.svn.wordpress.org/gandalf/branches/dev/ rev 510148. git-svn-id: http://svn.automattic.com/wordpress/trunk@19995 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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