Joins are taken in account for reduce queries

[Reductions]

No description provided.

[itsjoeconway]

Thanks! Would you be able to add a test to test/db/postgresql/aggregate_function_test.dart that runs the success case of this change?

The file package:aqueduct/src/dev/model_graph.dart has test ManagedObjects that have relationships. (This particular test's setUp method must be altered to include those models once the file is imported).