KNL-1043 Updated initial version of the Experience API to improve flexibility

git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@121941 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1015 allowing high and low policy files to be overridden in sakai home antisamy directory

git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@121942 66ffb92e-73f9-0310-93c1-f5514f145a0a