Change to passing an existing `rethinkdbdash` instance.
Change to passing an existing `rethinkdbdash` instance.

If you want to pass an existing instance, you now do so by passing it
as `options.r` (not as options). This stops self.options.table from
overwritting self.r.table fixing this issue:
https://github.com/llambda/session-rethinkdb/issues/10

llambda/session-rethinkdb