Unittest for issue #7.
Merge branch 'master' of https://github.com/furore-fhir/spark
Explicitly create BsonDateTime.
Closes #5
Corrected search on CodeableConcept with modifier :missing.
Closes #9.
Search returns an OperationOutcome on errors or warnings.
Introduced 'NormalizeNonChainedReferenceCriteria' to make Sprinkler test SE05 succeed.
Merge branch 'master' into develop