KNL-1042 improvements to the service to make statement generation easier

git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@123408 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1061 Real fix for antisamy allowing the data-mathml attribute on img tags



git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@123409 66ffb92e-73f9-0310-93c1-f5514f145a0a