document how to set up contrib tools


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@130566 66ffb92e-73f9-0310-93c1-f5514f145a0a
LSNBLDR-305; fix DTD to use hibernate.sourceforge.net


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@130574 66ffb92e-73f9-0310-93c1-f5514f145a0a