API calls to filter user list by username/email

add pagination to /api/users

add support of id based filtering

add num_pages field to users api output

add tests for paging data and ability to parse page_size from request

using ListAPIView and DRF filters

Disallow unfiltered lists

Updated docstrings
Merge pull request #63 from edx-solutions/ziafazal/add-filters-to-user-api

Ziafazal/add filters to user api
mattdrayer/api-workgroupreviews: Added link to workgroup reviews
Merge pull request #75 from edx-solutions/mattdrayer/api-workgroupreviews

mattdrayer/api-workgroupreviews: Added link to workgroup reviews
mattdrayer/api-secureapiview-fix: Resolved DRF view issue
Merge pull request #77 from edx-solutions/mattdrayer/api-secureapiview-fix

Mattdrayer/api secureapiview fix Tested - seemed to fix the right stuff for us!
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 #78 from aboudreault/discussion-tab

Discussion tab: contains required stuff for the discussion-course xblock
discussion: Update hash
cousemodulecompletion implentation

switch to APIView to support url conventions

merged with master
added new fields to organisation model

added lookup of organisation by user

merged with master
Merge pull request #76 from edx-solutions/ziafazal/course-module-completions

Ziafazal/course module completions
Merge pull request #79 from edx-solutions/ziafazal/add-fields-to-organization

Ziafazal/add fields to organization
mattdrayer/api-orgviewfix: Updated misspelled view name
Merge pull request #81 from edx-solutions/mattdrayer/api-orgviewfix

Mattdrayer/api orgviewfix
API Doc