Initial checkin of Line Follower

This line follower code is based on the RedBot Library.
Add Magician's Chassis Line Following Fritzing, jpg, and Sketch

This is a very simple line following algorithm. The code is organized
as a 3 level subsumption architecture and also uses an interface
similar to the Redbot library.
Merge pull request #10 from tamlicke/master

Add simple line following frizzing and sketch to class_4.