Removed unused enums

I am thinking that we are going to create "motor_driver" file
that takes in the readings and then decides how to drive the
motor.
Rewrote the pwm class

Rewrote the PWM class into a C/C++ file. Since it uses the Wire
library so we have to make it a C++ file but all of the functions
are static and can be called from C. So it really isn't C++ at
all.
Rewrote the shield library

This is a rewrite of Adafruit's MotorShield class. This is completely
in C and uses the PWM as a wrapper to call the Wire library.
Rewrote the stepper motor class

This is alot simplier and doesn't include the DC motors functions
that we do not use.
New motors are working :)
Delete the Adafruit Library

We have our own C library now!