Code changes to implement the spring 'scope' attribute for sessions

see reference from users mailing list requesting this feature
http://drools.46999.n3.nabble.com/Kie-Spring-Issue-not-able-to-created-Session-as-prototype-tp4030664.html

references from Spring
http://www.tutorialspoint.com/spring/spring_bean_scopes.htm
http://docs.spring.io/spring-framework/docs/3.2.3.RELEASE/spring-framework-reference/html/beans.html#beans-factory-scopes