Add Job Event Messaging to tasks.

* Added test for sample and cleanup

* Added skipEventsListener

* Added new message format.

* Added integration tests.

* Updated application.properties to add json content type

resolves spring-cloud/spring-cloud-task#119

spring-cloud-task-integration-tests/src/test/java/configuration/SkipItemReader.java

@@ -0,0 +1,45 @@
+/*
+ *  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 configuration;
+
+import org.springframework.batch.item.ItemReader;
+import org.springframework.batch.item.NonTransientResourceException;
+import org.springframework.batch.item.ParseException;
+import org.springframework.batch.item.UnexpectedInputException;
+
+/**
+ * @author Glenn Renfro
+ */
+public class SkipItemReader implements ItemReader{
+
+	int failCount = 0;
+	boolean finished = false;
+
+	@Override
+	public Object read() throws Exception, UnexpectedInputException, ParseException, NonTransientResourceException {
+		String result = "1";
+		if(failCount < 2) {
+			failCount++;
+			throw new IllegalStateException("Reader FOOBAR");
+		}
+		if (finished){
+			result = null;
+		}
+		finished = true;
+		return result;
+	}
+}