take other repository supertypes into account

at the moment the support for Spring Data (in the source code, validation, reconciling, content-assist) works for interfaces that extend the main Spring Data "Repository" interface. But there are a lot more interfaces that people could extend to use implement their own repositories (like JpaRepository, CrudRepository, ReadOnlyRepository). See http://blog.springsource.org/2011/07/27/fine-tuning-spring-data-repositories/ for an example. We need to add support for those repositories as well.