Update README.md
Update README.md
Resource Identity handling improved

Fixed failing tests, added some additional tests.
Major change here is to validate that the Resource Name is a valid
resource according to the model before returning it from the Collection
property on the ResourceIdentity object
Revert "Resource Identity handling improved"

This reverts commit 4ee6bbf598cff53b33398cb8cf24eda124f0b6fa.
Merge branch 'develop'
Added capability to retrieve the body of the request for push, post, etc
Added capability to get the body of the response
Merge branch 'master' of https://github.com/wdebeau1/fhir-net-api into bill-onbeforerequest
Integrated a (modified) solution to pass more meaningful request/response data to the OnBefore/OnAfterRequest hooks
Made sure multi-platform solution compiles.