BLTI-215

Check to see if the gradebook or gradebook2 are installed in the site before
offering the outsomces service.

Check to see if the Lessons tool is installed in the site before offering the
LORI service.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@120426 66ffb92e-73f9-0310-93c1-f5514f145a0a