Enhanced Dallas Temperature example with permanent sensor index

[LeoDesigner]

Hi everyone,
I have made some improvements to the Dallas Temperature Sensors example.

• made for non blocking main loop (useful for repeater and busy nodes)
  block time max 15ms for sensor read procedure
• it will remember a sensor index in EEPROM (2 bytes per sensor)
  in case if you need to replace or add a new sensor to the 1Wire bus - all other sensors will keep own sensor index

You are welcome to use it:
https://github.com/leodesigner/mysensors-arduino/tree/master/DallasTemperatureSensor_Recall

[redvoodoochild]

Thanks a lot !
You make my day !

[LeoDesigner]

@redvoodoochild
You welcome, I hope it will be useful for you too.