ivanseidel:
Did you installed correcly the library? http://arduino.cc/en/Guide/Libraries(Just add the unziped folder downloaded from gitHub, to your library folder (on your sketch folder, or, on the arduino software folder).
Note, that to the library be recognized, YOU MUST restart Arduino software
Ivan
Oh! I just did it! Many thanks! 
Then now I need to drive the stepper with your timer! Wish me luck!