Simultaneously support R4, STU3 and DSTU2#81

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rectalogic wants to merge 6 commits intosmart-on-fhir:masterfrom rectalogic:versioning

+158,069-60,000

Commits on Oct 11, 2019

Commits on Oct 12, 2019

Add integration tests and github CI action.
rectalogic
committed

Commits on Oct 15, 2019

DSTU2 uses a different json mime type than STU3/R4
rectalogic
committed

Commits on Oct 17, 2019

Install fhir-parser requirements when running tests.
rectalogic
committed