[UPDATE] v1.2 Ready to use

changelist
* Fixed incorrect code used to calculate kiloWatt/hour energy usage (thanks for @Tiago_Goncalves for spotting the issue)
* Added lastCheckinDate attribute for Epoch time/date stamp events that can be used with WebCoRE
* Added Temperature Offset preference setting
* Added device name to all debug messages
* Improved `refresh` command function
* Improved text of debug messages for clarity
* Removed unnecessary / unused code in `parse()`
* Minor code reformatting

devicetypes/bspranger/xiaomi-zigbee-outlet.src/xiaomi-zigbee-outlet.groovy

@@ -172,7 +172,7 @@ private Map parseReportAttributeMessage(String description) {
 	else if (descMap.cluster == "000C" && descMap.attrId == "0055" && descMap.endpoint == "03") {
 		def energy_int = Long.parseLong(descMap.value, 16)
 		def energy = Float.intBitsToFloat(energy_int.intValue())
-		energy = Math.round(energy * 100) * 0.001
+		energy = Math.round(energy * 100) * 0.0001
 		resultMap = createEvent(name: "energy", value: energy, unit: 'kWh')
 		log.debug "${device.displayName}: Reported energy usage is ${energy}kWh"
 	}