Create the DeployerPartitionHandler and related

DeployerStepExecutionHandler

Created a PartitionHandler that delegates to a TaskLauncher from Spring
Cloud Deployer to execute workers.

Resolves spring-cloud/spring-cloud-task#109

Updates per code review

spring-cloud-task-samples/batch-job/src/main/java/io/spring/BatchJobApplication.java

@@ -1,4 +1,4 @@
-package demo;
+package io.spring;
 
 import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
 import org.springframework.boot.SpringApplication;

spring-cloud-task-samples/batch-job/src/main/java/io/spring/configuration/JobConfiguration.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package demo.configuration;
+package io.spring.configuration;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;

spring-cloud-task-samples/batch-job/src/test/java/io/spring/BatchJobApplicationTests.java

@@ -14,19 +14,20 @@
  * limitations under the License.
  */
 
-package demo;
-
-import static junit.framework.Assert.assertEquals;
-import static junit.framework.Assert.assertTrue;
+package io.spring;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import org.junit.Rule;
 import org.junit.Test;
+
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.test.OutputCapture;
 
+import static junit.framework.Assert.assertEquals;
+import static junit.framework.Assert.assertTrue;
+
 /**
  * Verifies that the Task Application outputs the correct task log entries.
  *
@@ -69,6 +70,7 @@ public class BatchJobApplicationTests {
 		String taskTitle = "Demo Batch Job Task";
 		Pattern pattern = Pattern.compile(taskTitle);
 		Matcher matcher = pattern.matcher(output);
+
 		int count = 0;
 		while (matcher.find()) {
 			count++;