Remove unused function
Centralize when json parsing of responses from controller_query_service happens
Collect metrics around the open_ended_grading controller_query_service
Correctly catch RubricParsingErrors
Make GradingServices always return dictionaries, rather than sometimes returning strings
Record metrics about the peer grading service
Record metrics about the staff grading service
Actually push json parsing all the way down to the bottom of the GradingService get and post methods
Merge pull request #3091 from cpennington/ora-metrics

Add metrics around old ORA requests