Enable find(..) and findOne(..) to work with setObjectClass(..).
Include upserted objects in writeresult.
Merge pull request #54 from nilstgmd/feature/upsert_return_correct_n

Include upserted objects in writeresult.
Merge pull request #53 from nilstgmd/feature/set_object_class_for_find_findOne

Enable find(..) and findOne(..) to work with setObjectClass(..).