Added HttpStatus delegate in the Groovy DSL Response

with this change there are numerous helper methods that should provide a more descriptive DSL for the response status. Instead of a numerical status you can now call a method e.g. instead of 200 call OK()

fixes gh-575

docs/src/main/asciidoc/spring-cloud-wiremock.adoc

@@ -371,7 +371,7 @@ Contract.make {
         }
     }
     response {
-        status 200
+        status OK()
         body('''
         bar
         ''')

docs/src/main/asciidoc/verifier_contract.adoc

@@ -357,10 +357,13 @@ include::{verifier_core_path}/src/test/resources/yml/contract.yml[tags=response,
 include::{verifier_core_path}/src/test/resources/yml/contract.yml[tags=response_obligatory,indent=0]
 ----
 
-
 Besides status, the response may contain **headers** and a **body**, both of which are
 specified the same way as in the request (see the previous paragraph).
 
+TIP: Via the Groovy DSL you can reference the `org.springframework.cloud.contract.spec.internal.HttpStatus`
+methods to provide a meaningful status instead of a digit. E.g. you can call
+`OK()` for a status `200` or `BAD_REQUEST()` for `400`.
+
 === Dynamic properties
 
 The contract can contain some dynamic properties: timestamps, IDs, and so on. You do not
@@ -929,7 +932,7 @@ Contract.make {
         url("/foo")
     }
     response {
-        status 200
+        status OK()
         body(events: [[
                                  operation          : 'EXPORT',
                                  eventId            : '16f1ed75-0bcc-4f0d-a04d-3121798faf99',
@@ -1007,7 +1010,7 @@ org.springframework.cloud.contract.spec.Contract.make {
         url '/get'
     }
     response {
-        status 200
+        status OK()
         body 'Passed'
         async()
     }

docs/src/main/asciidoc/verifier_faq.adoc

@@ -151,7 +151,7 @@ org.springframework.cloud.contract.spec.Contract.make {
 					])
 				}
 			response {
-				status 200
+				status OK()
 				body([
 					    time : value(producer(regex('[0-9]{4}-[0-9]{2}-[0-9]{2} [0-2][0-9]-[0-5][0-9]-[0-5][0-9]')),
 					    id: value([producer(regex('[0-9a-zA-z]{8}-[0-9a-zA-z]{4}-[0-9a-zA-z]{4}-[0-9a-zA-z]{12}'))

docs/src/main/asciidoc/verifier_introduction.adoc

@@ -249,7 +249,7 @@ org.springframework.cloud.contract.spec.Contract.make {
 		}
 	}
 	response {
-		status 200
+		status OK()
 		body([
 			   fraudCheckStatus: "FRAUD",
 			   "rejection.reason": "Amount too high"