Updated Conformance Resource to FHIR DSTU 2.0 (v0.4.0-3886)

 Updated Conformance.json for resource.interaction replacing resource.operation
 Updated Conformance Resource
 Added document, event, interaction, messaging Conformance Resources
 Modified resource, rest, search_param Conformance Resources
 Added document, event, interaction, messaging json and xml conformance views
 Modified conformance, resource, rest, and search_param existing json and xml views
 Updated fhir-conformance json, xml, and yaml test files