Finished test cases for answer consolidation within the API
Fixed parameter conversion to boolean
Make consolidate parameter case-insensitive
Increase verbosity of parameter name
ConsolidatedAnswerDistributionSerializer now a subclass of ProblemResponseAnswerDistributionSerializer
Implemented changes suggested in comments on open PR
Minor pep8 violation fixed
Responded to jbau's latest PR comment
Re-added missing import statement
Removed GET parameter for consolidation in favor of mandatory use, updated test cases
Moved non-consolidation logic out of initial loop to avoid returning partial set of data
