mattdrayer/api-workgroupsubmissions: Added resource link to view submissions
Merge pull request #88 from edx-solutions/mattdrayer/api-workgroupsubmissions

Mattdrayer/api workgroupsubmissions
mattdrayer/api-coursegrades: Added support for viewing a set of grades for a course.  Includes filters/aggregations.
API Doc
Merge pull request #82 from edx-solutions/mattdrayer/api-coursegrades

Mattdrayer/api coursegrades
added document_filename field to submissions model

Removed course module migration
Merge pull request #92 from edx-solutions/ziafazal/add-document-name-to-submissions

Ziafazal/add document name to submissions
Merge pull request #69 from edx-solutions/mh/api-doc-rebase

API Doc for API Courses module
add social metrics to the comment client

add some better error handling