replace calls to jQuery to grp.jQuery
don't include jquery-ui since it's already included by Grappelli
Upgrade jQuery nestedSortable plugin to its latest version.

The isOverAxis function has been removed in jQueryUI 1.10.
update urls to filebrowser which are now namespaced
update default tinymce_setup.js with the one from Grappelli
use new filebrowser urls structure, include grappelli urls
update setup.py to require django-filebrowser and django-grappelli