Jpa eclipselink compability

- With this change, Eclipselink support is added to SSM.
  To do this, table names are modified and some primitive
  types are changed to object types.
- Edited import class types.
- Relates #833
- Relates #834

spring-statemachine-data/mongodb/src/main/java/org/springframework/statemachine/data/mongodb/MongoDbRepositoryState.java

@@ -180,7 +180,7 @@ public class MongoDbRepositoryState extends RepositoryState {
 	}
 
 	@Override
-	public boolean isInitial() {
+	public Boolean isInitial() {
 		return initial;
 	}