Updated Group Project XBlock hash
mattdrayer/api-authn-401to403: Changed error response from 401 to 403 Forbidden
Merge pull request #85 from edx-solutions/mjames/update_group_project_xblock

Updated Group Project XBlock hash
Merge pull request #86 from edx-solutions/mattdrayer/api-authn-401to403

Mattdrayer/api authn 401to403
Made small tweak to group project
is_private field and workgroup lookup

added is_private field to workgroup model and lookup of workgroup by
users

added organization field to Project

Fixed broken test