DATACMNS-304 - Fixed compile error on JDK6.

Changed variable declaration in PageableHandlerMethodArgumentResolver from int to Integer to satisfy JDK6 generics resolution.
DATAJPA-265 - Make it possible to configure auditing with Java Config.

Added AuditingBeanDefinitionRegistrarSupport base implementation for ImportBeanDefinitionRegistrar, store specific implementation should extend this class. Registers an AuditingHandler base on the configuration provided.