dependency upgrade to spring 4, spring-security 3.2.3 and servlet 3
Cutsomer Jpa2PersistenceUnitInfoDecorator no longer required in Spring 4 where JPA2 is by default
Jpa2PersistenceUnitInfoDecorator no longer in use, jpa2 by default
MergeContextLoaderListener no longer required, MergeContextLoader now also is ServletContextListener