Use json_encode() for adding script data (formerly l10n). Add the same...

Use json_encode() for adding script data (formerly l10n). Add the same functionality to WP_Styles for adding inline css after a stylesheet has been outputted. See #11520

git-svn-id: https://core.svn.wordpress.org/trunk@18464 1a063a9b-81f0-0310-95a4-ce76da25c4cd