Modified core to support drop and schema-sqlf.sql but leverages derby syntax outside of connection string.

Modified *.properties file to add additional property "batch.isolationlevel=ISOLATION_SERIALIZABLE
because batch-sqlf.properties needs batch.isolationlevel=ISOLATION_READ_COMMITTED.
Added corresponding sqlf properties and sqlf files.
Modified simple-job-launcher-context.xml to support the p:isolationLevelForCreate="${batch.isolationlevel}"

spring-batch-samples/pom.xml

@@ -17,6 +17,11 @@
 		<environment>hsql</environment>
 	</properties>
 	<dependencies>
+			<dependency>
+				<groupId>com.vmware.sqlfire</groupId>
+				<artifactId>sqlfireclient</artifactId>
+				<version>1.0.3</version>
+			</dependency>
 		<dependency>
 			<groupId>org.springframework.batch</groupId>
 			<artifactId>spring-batch-core</artifactId>