Roboclaw

The roboclaw/pololu based segway is working well now with the new motors. I have closed the attitude loop with the gyros and the EKF pitch estimate. I will soon close the position loop with the encoders.

Note*: I added a new config script for segway since it was removed from default. Maybe we should default to not building all configs in the directory because of this. I think it makes sense for small side projects like this to be accessible through custom configs.

tile: http://youtu.be/VwzPdg_skVg

carpet: http://youtu.be/SCSPpHvhteE