REOPENED - issue BATCH-825: Modify JobLauncher contract to not throw exception on job failure.

http://jira.springframework.org/browse/BATCH-825

Cleaned up SimpleJob some.  There was still some odd looping behavior, so I abstracted into another inner method.

spring-batch-core/src/test/java/org/springframework/batch/core/job/SimpleJobTests.java

@@ -235,6 +235,7 @@ public class SimpleJobTests extends TestCase {
 		assertEquals(1, jobExecution.getAllFailureExceptions().size());
 		assertEquals(exception, jobExecution.getAllFailureExceptions().get(0));
 		assertEquals(0, list.size());
+		assertEquals(BatchStatus.FAILED, jobExecution.getStatus());
 		checkRepository(BatchStatus.FAILED, ExitStatus.FAILED);
 	}