Nixie Tube Ciapapuer - 3 - final firmware

Lately I have pushed to github a new version of the Nixie Tube Ciapapuer firmware.

The main change lies in the way the random number generator is initialised, that now relies on an external library called Entropy. For simplicity I added the library in the github area too. It relies on small speed differences of oscillators within the Arduino microcontroller.

A second change is that the depoison routine (or slot-machine effect) can go either backwards or forward, and it's all chosen randomly.

That's it.