Docker images (#527)

with this change we're adding generation of 2 docker images - verifier and stub runner
we also added a project `spring-cloud-contract-stub-runner-boot` which contains a far jar with stub runner boot

fixes gh-526, gh-516

spring-cloud-contract-stub-runner-boot/src/main/java/org/springframework/cloud/contract/stubrunner/server/StubRunnerBoot.java

@@ -0,0 +1,33 @@
+/*
+ *  Copyright 2013-2017 the original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.springframework.cloud.contract.stubrunner.server;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author Marcin Grzejszczak
+ */
+@SpringBootApplication
+@EnableStubRunnerServer
+public class StubRunnerBoot {
+
+	public static void main(String[] args) {
+		SpringApplication.run(StubRunnerBoot.class, args);
+	}
+
+}