Refactor heartbeat to delegate to the modulestores and sql
LMS-2801
Speed up test by fixing negative assertion
Speed up test for closed caption state
fix reply/return to annotation links
STUD-1629
Improve certificates test time
Merge pull request #3898 from edx/zub/bugfix/std1629-annotationtool

fix reply/return to annotation links
Added manual refund page for support.
PR-615
Merge pull request #3908 from edx/dcs/support-dashboard

Added manual refund page for support.
PR-615
Merge pull request #4078 from edx/dhm/heartbeat

Refactor heartbeat to delegate to the modulestores and sql
Merge pull request #4115 from edx/zoldak/fix-test-captions-closed

Speed up test for closed caption state
Merge pull request #4114 from edx/zoldak/fix-negative-assertion

Speed up test by fixing negative assertion
Merge pull request #4125 from edx/ammar/improve-certificates-test-time

Improve certificates test time