Adding a method to pass in taskName for new empty TaskExecution

Resolves #298

Added test and add param to javadoc

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/repository/TaskRepository.java

@@ -70,6 +70,19 @@ public interface TaskRepository {
 	@Transactional
 	TaskExecution createTaskExecution(TaskExecution taskExecution);
 
+	/**
+	 * Creates an empty TaskExecution with just an id and name provided. This is intended to be
+	 * utilized in systems where the request of launching a task is separate from the
+	 * actual start of a task (the underlying system may need to deploy the task prior to
+	 * launching, etc).
+	 *
+	 * @param name task name to be associated with the task execution.
+	 *
+	 * @return the initial {@link TaskExecution}
+	 */
+	@Transactional
+	TaskExecution createTaskExecution(String name);
+
 	/**
 	 * Creates an empty TaskExecution with just an id provided. This is intended to be
 	 * utilized in systems where the request of launching a task is separate from the

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/repository/support/SimpleTaskRepository.java

@@ -115,15 +115,20 @@ public class SimpleTaskRepository implements TaskRepository {
 	}
 
 	@Override
-	public TaskExecution createTaskExecution() {
+	public TaskExecution createTaskExecution(String name) {
 		initialize();
 		TaskExecution taskExecution =
-				taskExecutionDao.createTaskExecution(null, null,
+				taskExecutionDao.createTaskExecution(name, null,
 						Collections.<String>emptyList(), null);
 		logger.debug("Creating: " + taskExecution.toString());
 		return taskExecution;
 	}
 
+	@Override
+	public TaskExecution createTaskExecution() {
+		return createTaskExecution((String)null);
+	}
+
 	@Override
 	public TaskExecution startTaskExecution(long executionid, String taskName, Date startTime, List<String> arguments,
 			String externalExecutionId) {