Updated Code: Temperature, Humidity, On-Demand Status Update

* Renamed temperature to target_temperature and current_temperature to temperature due to confusion.  Both will work for changing the target temperature. 
* Added target_humidity for read and write.
* Added update_status to retrieve the latest data from the server, saving it into self.status_json.
* Modified status to call update_status if self.status_json is not populated yet (which should not happen).
* Modified temperature= and humidity= to call update_status once the change is saved.
* Increased version to 0.0.5.