DATAGRAPH-392 - Add support for custom findAll Queries.

Annotated @Query annotation with @QueryAnnotation to mark it as a custom query annotation. Added appropriate test cases. Updated dependency of SD Commons to 1.7.0.BUILD-SNAPSHOT.

This feature can be merged to master as soon as https://github.com/spring-projects/spring-data-commons/pull/43 has been merged into SD Commons master.