Addition of LCD module.

 - Added some lowres pics and updated README.md with more info.

 - Since the LCD lib uses some of the pins we have been using for the
   servos, the pin definitions in config.h was changed.

 - Fixed some issues with not being able to exit line follow mode with
   the remote, and being able to enter line follow mode multiple times.

 - Added the new LCD module as a task that will get details from other
   tasks and instance objects to display on the screen. The LCD update
   task runs periodically and is configued by a refresh period value in
   config.h

 - Fixed a bug where the drive train was initialized with hardcoded pin
   numbers instead of the pin defines from config.h

 - Added a `isActive` method to the line follower object to return the
   current state of the line follower.