Added support for Stub Runner and Pact Broker

fixes gh-191
commit 533f1d3d0e8f6dcd37677bfef555fc2ea86bc1b1
Author: Tim Ysewyn <Tim.Ysewyn@me.com>
Date:   Wed Mar 7 15:56:48 2018 +0100

    Upgraded pact-jvm-model to 3.5.13

spring-cloud-contract-wiremock/src/main/java/org/springframework/cloud/contract/wiremock/WireMockSpring.java

@@ -66,8 +66,7 @@ public abstract class WireMockSpring {
 			}
 			initialized = true;
 		}
-		WireMockConfiguration config = new WireMockConfiguration();
-		return config;
+		return new WireMockConfiguration();
 	}
 
 }