mattdrayer/api-users-courses-roles: Added support for setting user roles
Updating Group-project XBlock hash
Merge pull request #148 from edx-solutions/mattdrayer/api-users-courses-roles

mattdrayer/api-users-courses-roles: Added support for setting user roles
mentoring-assessments: Update hash
xblock-callable-default: Update hash
xblock-callable-default: Update hash
Fix test related to course_groups
Fix some more rebase issues in django_comment_client