Always use celsius temperature units in protocol

Even though homekit has the temperature unit field, actual temperatures are always communicated in celsius - the characteristic is only used for display purposes.

Author: andylintner

src/main/java/com/beowulfe/hap/impl/characteristics/thermostat/AbstractTemperatureCharacteristic.java

@@ -1,15 +1,14 @@
 package com.beowulfe.hap.impl.characteristics.thermostat;
 
 import com.beowulfe.hap.accessories.TemperatureSensor;
-import com.beowulfe.hap.accessories.properties.TemperatureUnit;
 import com.beowulfe.hap.characteristics.EventableCharacteristic;
 import com.beowulfe.hap.characteristics.FloatCharacteristic;
 
 public abstract class AbstractTemperatureCharacteristic extends FloatCharacteristic implements EventableCharacteristic {
 
 	public AbstractTemperatureCharacteristic(String type, boolean isWritable, String description, TemperatureSensor sensor) {
 		super(type, isWritable, true, description, sensor.getMinimumTemperature(), sensor.getMaximumTemperature(),
-				0.1, sensor.getTemperatureUnit() == TemperatureUnit.CELSIUS ? "celsius" : "fahrenheit");
+				0.1, "celsius");
 	}
 
 }