Add jQuery UI core effects
Add jQuery UI core effects

switchClass is used by the current tree editor implementation.

matthiask/feincms2-content,joshuajonah/feincms,pjdelport/feincms,nickburlett/feincms,matthiask/django-content-editor,feincms/feincms,hgrimelid/feincms,feincms/feincms,hgrimelid/feincms,nickburlett/feincms,joshuajonah/feincms,michaelkuty/feincms,mjl/feincms,matthiask/feincms2-content,matthiask/django-content-editor,nickburlett/feincms,michaelkuty/feincms,matthiask/django-content-editor,mjl/feincms,mjl/feincms,hgrimelid/feincms,pjdelport/feincms,matthiask/django-content-editor,feincms/feincms,joshuajonah/feincms,michaelkuty/feincms,joshuajonah/feincms,michaelkuty/feincms,nickburlett/feincms,pjdelport/feincms,matthiask/feincms2-content