Revert "a few changes"

This reverts commit d682d3e57b9da8087028582b5c35ed85bec07b37.
Revert d682d3e..cc704b9

This rolls back to commit d682d3e57b9da8087028582b5c35ed85bec07b37.
Add libraries

You will need whole of them to use the Race Car Project code. For
information on installing libraries, see:
http://arduino.cc/en/Guide/Libraries