Support json path in the response (#170)

* jsonpath in response

* Fix tests

* Support also BodyAsJson

* Fix Sonar Issue

* Add example (zubinix2)

* Fix batch file

* Solve CodeFactor issues

* netcoreapp2.0;netcoreapp2.1

* 1.0.4.8

src/WireMock.Net/Owin/OwinResponseMapper.cs

@@ -76,6 +76,11 @@ namespace WireMock.Owin
 #endif
             )
         {
+            if (responseMessage == null)
+            {
+                return;
+            }
+
             response.StatusCode = responseMessage.StatusCode;
 
             byte[] bytes = null;