SCT-23 Added sample apps for Spring Cloud Task

* Timestamp  Demonstrates a Spring boot/task application as a single java file.
* HelloWorld Demonstrates a Spring boot/task application using java configuration.

resolves spring-cloud/spring-cloud-task#23

spring-cloud-task-samples/timestamp/src/main/java/org/springframework/cloud/task/timestamp/TaskApplication.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2015 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.task.timestamp;
+
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.cloud.task.annotation.EnableTask;
+import org.springframework.cloud.task.annotation.Task;
+import org.springframework.context.annotation.Bean;
+
+/**
+ * Spring Boot Application that has tasks enabled.
+ */
+@SpringBootApplication
+@EnableTask
+@EnableConfigurationProperties({ TimestampTaskProperties.class })
+public class TaskApplication {
+
+	@Bean
+	public TimestampTask timeStampTask() {
+		return new TimestampTask();
+	}
+
+	public static void main(String[] args) {
+		SpringApplication.run(TaskApplication.class);
+	}
+
+	/**
+	 * A commandline runner that prints a timestamp and is annotated with @Task.
+	 */
+	@Task("Demo Timestamp Task")
+	public class TimestampTask implements CommandLineRunner {
+		private final org.slf4j.Logger logger = LoggerFactory.getLogger(TimestampTask.class);
+
+		@Autowired
+		private TimestampTaskProperties config;
+
+		@Override
+		public void run(String... strings) throws Exception {
+			DateFormat dateFormat = new SimpleDateFormat(config.getFormat());
+			logger.info(dateFormat.format(new Date()));
+		}
+	}
+}

spring-cloud-task-samples/timestamp/src/main/java/org/springframework/cloud/task/timestamp/TimestampTaskProperties.java

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+/*
+ * Copyright 2015 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.task.timestamp;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.util.Assert;
+
+/**
+ * @author Glenn Renfro
+ */
+@ConfigurationProperties
+public class TimestampTaskProperties {
+
+	/**
+	 * The timestamp format, "yyyy-MM-dd HH:mm:ss.SSS" by default.
+	 */
+	private String format = "yyyy-MM-dd HH:mm:ss.SSS";
+
+	public String getFormat() {
+		Assert.hasText(format, "format must not be empty nor null");
+		return format;
+	}
+
+	public void setFormat(String format) {
+		this.format = format;
+	}
+}