Node setting seems to work
Node setting seems to work

To add a new node: "A hh hh hh hh hh hh hh hh"
- Reads first two bytes of each token in hex and ignores the rest.
- Prints number of nodes set to serial
- Stops adding nodes once EEPROM full
- No error checking yet.
- Only accepts upper case for hex values.
To clear all nodes: "A *"
opentrv/OpenTRV-Arduino-V0p2,opentrv/OpenTRV-Arduino-V0p2,opentrv/OpenTRV-Arduino-V0p2