* Causes the Manage Themes page to refresh if the customizer is closed after the active theme is switched.
* Changes the text of the 'Save and Activate' button once the theme has been activated.
* Improves the naming of the customize control settings.
* Add events to customize.Loader and make callbacks more flexible.
* Makes the customize-loader l10n compatible with non-admin settings.
* Adds WP_Customize->is_current_theme_active().
* Minor style corrections, including jQuery.attr/prop changes.
git-svn-id: https://develop.svn.wordpress.org/trunk@20802 602fd350-edb4-49c9-b593-d223f7449a82