Implemented Get Radiology Data from External Party and Store
1. Get FHIR DiagnoticReport from http://fhir-dev.healthintersections.com.au/open/DiagnosticReport?subject.given=Roelof Olaf&service.code=RAD
2. Before want to save it as an Encounter, need to Save Patient
3. Get FHIR Patient Resource http://fhir-dev.healthintersections.com.au/open/Patient/f201 ( id = f201 )
4. Before saving patient, check whether it's existing or not. If it's existing retrieve, otherwise store it.
5. Same for Performer (ignore if it's an Organization)
6. Store as an Encounter, then send back result