Pololu based stepper motor driver

If all goes well, I can hook up my new stepper driver today. It is
from Rob Giseburt (http://www.thingiverse.com/thing:4526) and offers a
smooth 1/16th stepping mode, connectors for end stops and utilizes the
pololu stepper boards. So if one blows, it is just a matter of plug
and play to get going again.

I assembled it today and connected it. It is really nice. Makes the
Makerbot very quiet (not that I would really care, but maybe the
neightbours).