Fix new Delete with body missing from IWireMockAdminApi interface (#413)

* Fix new Delete with body missing from IWireMockAdminApi interface

* Admin Delete with mappings in body (#409)

* Add unit test for delete with body

* change order of checks for readability. looks nicer.

* Allow body in DELETE requests

* Fix unit tests according to DELETE supporting body

* Re-run CI

* Fix DELETE with body unit test

* Fix ElementAt index in mappings list

* Fix DELETE with body unit test

* Fix theory tag must be accompanied by some InlineData or Member

* Fix didn't use correct checking syntax

* Fix wrap entire unit test in if region

src/WireMock.Net/Util/BodyParser.cs

@@ -34,7 +34,7 @@ namespace WireMock.Util
             { "GET", false },
             { "PUT", true },
             { "POST", true },
-            { "DELETE", false },
+            { "DELETE", true },
             { "TRACE", false },
             { "OPTIONS", true },
             { "CONNECT", false },