DATACMNS-388 - Improve declaration of PagedResourceAssembler in JavaConfig.

Based on the discussion in SPR-11004 [0], the declaration of the PagedResourcesAssembler in HateoasAwareSpringDataWebConfiguration will not result in it being autowired using Spring 4.0 in certain circumstances.  This change loosens the declaration so that it can be autowired into declarations that have specific generics declarations.

Original pull request: #51.

[1]: https://jira.springsource.org/browse/SPR-11004