ziafazal/api-added-participant-activity-to-metrics: added

active_users and users_enrolled metrics
mentoring: Update hash
added organization filter
Merge pull request #276 from edx-solutions/ziafazal/api-added-participant-activity-to-metrics

ziafazal/api-added-participant-activity-to-metrics:
Merge pull request #277 from edx-solutions/ziafazal/api-add-org-filter-to-social-stats

added organization filter
xblock-utils: Add hash to requirements
mattdrayer/api-serialize-content-fix: Addressed id/key issue
Merge pull request #279 from edx-solutions/mattdrayer/api-serialize-content-fix

mattdrayer/api-serialize-content-fix: Addressed id/key issue
mentoring: Update hash
ziafazal/api-exclude-unenrolled-from-counts:exclude

un-enrolled users from counts
Merge pull request #280 from edx-solutions/ziafazal/api-exclude-unenrolled-from-counts

ziafazal/api-exclude-unenrolled-from-counts:exclude un-enrolled users from course metrics/counts
mattdrayer/api-time-series-fix: Use backticks instead of quotes
Merge pull request #281 from edx-solutions/mattdrayer/api-time-series-fix

mattdrayer/api-time-series-fix: Use backticks instead of quotes
added active flag on organisation metrics
Merge pull request #282 from edx-solutions/ziafazal/api-exclude-unenrolled-from-org-metrics

added active flag on organisation metrics
ziafazal/api-strip-unenrolled-users-from-social-stats

strip un-enrolled users from social stats
Merge pull request #284 from edx-solutions/ziafazal/api-strip-unenrolled-users-from-social-stats

ziafazal/api-strip-unenrolled-users-from-social-stats:strip un-enrolled users from social stats
ziafazal/api-org-groups-relationship: added group

association with organisation
fixed mysql date time error

added if check for mysql
Merge pull request #283 from edx-solutions/ziafazal/api-fix-bug-mysql-datetime-error

fixed mysql date time error and broken organization tests