Added support for recently played station tracks

Again, I had serious problems on running useful tests. I would simply add a call like this.
```
            self.mc.get_station_tracks(station_id, num_tracks=1, [TEST_AA_SONG_ID])
```
Would it be OK?
can we also change the param to `recently_played_ids` and update the docs to make it more clear that we don't expect track dicts here?