Where do I download the DHT library used in your program ESP8266_DHT22_humidity_sensor_REST? When I load the program into the Arduino IDE I get all kinds of errors regarding DHT calls such as 'class DHT has no member named 'getStatusString' and 'class DHT has no member named dht.getHumidity'.
I've used the DHT22 in several other programs successfully (downloaded the DHT library from Adafruit).