Created official Robot API

It's time to take all the code we have (or plan to write) and package it
in a full API. I moved all our files to a folder called api, and then
created api_example.c to show how to use the api in all our programs.
Finished the example program (spin the wheel)

SpinTheWheel is a sample program that takes input from joy1_y1 and sets
the speed of a motor on S1_C1_1 accordingly