Fixed #12882 - Moved the admin's jQuery into our own namespace to lower the...

Fixed #12882 - Moved the admin's jQuery into our own namespace to lower the risk of a clash with third party apps that use jQuery.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12966 bcc190cf-cafb-0310-a4f2-bffc1f526a37