new api to get list of workgroups by group
course leaders by points_scored

updated urls

updated docs
Merge pull request #110 from edx-solutions/ziafazal/course-proficiency-leaderboard

course leaders by points_scored
Updated Group Project XBlock Hash
Merge pull request #111 from edx-solutions/ziafazal/get-workgroups-of-a-group

new api to get list of workgroups by group - LGTM :+1: merging to allow group project XBlock to access it
Group Poejct XBlock update to use new API endpoint
position of user in completions and course avg

added completions to response dict

Merged course completions leaders and course avg

added is_active check

pep8 compliant

remove serialiser class
ooyala: update hash
Merge pull request #113 from edx-solutions/ziafazal/course-completion-leaders

course completions leaderboard
adding proficiency metrics

added active filter

added tests
Merge pull request #116 from edx-solutions/ziafazal/course-proficiency-position

adding proficiency metrics
Initial setup of sessions doc
Sessions api doc initial setup
edits