BLTI-230

Switch to a jackson-style of objects - attempt to do a loop-back in
a unit test but fail.  Check-in so I can call in for some help.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/branches/BLTI-230@125966 66ffb92e-73f9-0310-93c1-f5514f145a0a