Merge pull request #40 from alxdarksage/survey-responses

Testing new API to submit identifier for survey response
change ConsentSignature.birthdate from DateTime (full timestamp) to LocalDate (calendar date)
added comments re: LocalDate serialization
Merge pull request #42 from DwayneJengSage/develop

change ConsentSignature.birthdate from DateTime (full timestamp) to LocalDate (calendar date)
Fixing test cleanup