Added wrist rotate to robotic arm proto 2

Over the weekend, I had a chance to modify the Robotic Arm Prototype and add a wrist rotation servo and accompanying gears.  I also shortened the forearm part of the robotic arm to take some of the stress off of the elbow servo.  In addition, I changed out the shoulder servo to a higher torque model to help with the stability of the robot.  Unfortunately, due to many things that I had to get done over the weekend, I did not have time to check out the functioning of the arm with the Laptop and SSC-32.  I really need to check out the moment arm equations to see if the servo torque values are correct for this Prototype version 2.  Maybe I will have time to do that tonight after work.