Extra degree of freedom for modular robotics REPY-2.0 module

Little extra for the REPY-2.0 mechanical module for modular robotics.

Here are some videos about the added funcionality:
http://youtu.be/H3VW2Z-FlzI
http://youtu.be/l1j4gek27yQ

Here, more info about the REPY (the version previous to the 2.0):
http://www.thingiverse.com/thing:13442
http://www.iearobotics.com/wiki/index.php?title=M%C3%B3dulos_REPY-1

And, finally, the REPY-2.0 repository on github (this object is in the 'experimental' branch, and for a good reason):
https://github.com/David-Estevez/REPY-2.0

This thing, and the REPY-2.0, have been created with the Object-Oriented Mechanics Library (OOML):
http://iearobotics.com/oomlwiki/doku.php?id=start