Issue #185 - add comment to surveyInstanceSummarizer
Issue #185 - add surveyInstanceSummarizer code to DataProcessorRestServlet
Issue #185 - add logging to RawDataRestServlet
Issue #185 - disable surveyInstance summarisers in TaskServlet
Issue #185 - add surveyInstanceId and qasId fields to DataProcessorRequest class
Issue #185 - add summariser code to surveyInstanceDao