added workgroup users delete support
get projects by course
added organisation to users api

added id, name and created fields

Added display_name to basic serializer
get course completions by user

fix for breaking test
Merge pull request #100 from edx-solutions/ziafazal/delete-user-from-workgroup

added workgroup users delete support
Merge pull request #107 from edx-solutions/ziafazal/get-course-completion-by-user

get course completions by user
Merge pull request #95 from edx-solutions/ziafazal/add-orgs-to-users-api

Ziafazal/add orgs to users api
Merge pull request #101 from edx-solutions/ziafazal/get-projects-by-course

get projects by course :+1:
Update XBlock hash key
mattdrayer/api-groups-organizations-list: Support for viewing related orgs
Merge pull request #109 from edx-solutions/mattdrayer/api-groups-organizations-list

mattdrayer/api-groups-organizations-list: Support for viewing related or...
mattdrayer/api-groups-organizations-list: Support for viewing related orgs

merged with master and updated url
Merge pull request #108 from edx-solutions/ziafazal/user-count-by-city

user count by city and users enrolled in a course
course leaders by points_scored