enabling rationale in map reduce jobs. This creates a list on the patient_cache entries for each data criteria in a measure and whetehr or not the patient had clinical data that matched that dc.  Also added a configurable flag in the popHealth.yml file for enableing verbose logging in the map reduce jobs.  This flag enables verbose logging in the mongodb map reduce portion of calculations as it steps through the measure logic.  This is off by defualt as it can exceed the 16meg limit of mongo records for certain patients ehen enabled and should be used as a debugging item only.
making rationale logging configurable in the pophelath.yml file
Merge branch 'enable_rationale'

Rebasing and merging pull request #187