Changing the delete method to return the previous records (similar to sails-mongo), as this makes it easier to trigger socket events using the model "afterDestroy" and makes it consistent with other CRUD methods.

Note, this change requires Oriento with commit: https://github.com/dmarcelino/oriento/commit/59d96ed25d8886590c79feff03f089b48377119c (pending pull request)