Updated joystick example

It's come to my attention that the joystick example scripts are pretty far out of date and definitely don't work very well with manticore.

I have updated an example joystick script that will work with manticore

https://github.com/MyRobotLab/pyrobotlab/blob/develop/home/kwatters/joys...

This is a very simple example of the joystick analog stick x axis controlling the speed and direction of the a servo motor.  This is a much more simplified approach than having to deal with the "sweep" function on the servo.