add motor controller to bill of materials

[challenge-bot] / README.md

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 # challenge-bot
 
+## prerequisites
+
+install the following software:
+
+[openSCAD](http://www.openscad.org/downloads)
+
+[fritzing](http://fritzing.org/download/)
+
+[arduino ide](http://arduino.cc/en/Main/Software)
+
 ## quickstart
 
-[openSCAD tutorial](http://xib.me/s2ry)
+[openSCAD tutorial](http://goo.gl/E3OQXc)
 
-[assemble the hardware](http://xib.me/s378)
+[assemble the hardware](http://goo.gl/EV0FCJ)
 
-[wire and load code to the robot](http://xib.me/s379)
+[wire and load code to the robot](http://goo.gl/srWpeI)
 
 ## Introduction