link orgs to groups

Generated migration
Fixed malformed uri issue with course resources
Merge pull request #89 from edx-solutions/ziafazal/add-groups-to-org

Ziafazal/add groups to org
Merge pull request #90 from edx-solutions/ziafazal/coursedetail=malformed-uri

Ziafazal/coursedetail-malformed uri
discussion-tab: Make the discussion tab working with the new discussion_app and fix some issues related to the discussion-course xblock.

Course Discussion Page now uses the discussion_app and course context added for the xblock
Merge pull request #80 from aboudreault/discussion-tab

Discussion tab
Rebased