[REQUEST] Support for DHT11 (Humidity and Temperature) sensor

[Hedda]

Request support for DHT11 (Humidity and Temperature) sensor:

https://www.itead.cc/humidity-temperature-sensor-dht11.html

https://www.itead.cc/electronic-brick-dht11-humidity-temperature-sensor-brick.html

https://www.itead.cc/wiki/DHT11_Humidity_Temperature_Sensor_Brick

DHT11 sensors are less expensive and less accurate than DHT22

Please also see the request for DHT22 support -> #8