Add Task Event Listener

Adds a Task Listener that emits the TaskExecution as an event via a
Spring Cloud Stream channel (essentially the listener serves as a SCSt
Source).

Resolves spring-cloud/spring-cloud-task#11

spring-cloud-task-samples/task-events/src/main/java/io/spring/TaskEventsApplication.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2016 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 io.spring;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.task.configuration.EnableTask;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@SpringBootApplication
+@EnableTask
+public class TaskEventsApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(TaskEventsApplication.class, args);
+	}
+
+	@Configuration
+	public static class EventEmittingTaskConfiguration {
+
+		@Bean
+		public CommandLineRunner commandLineRunner() {
+			return new CommandLineRunner() {
+				@Override
+				public void run(String... args) throws Exception {
+					System.out.println("The CommandLineRunner was executed");
+				}
+			};
+		}
+	}
+}