Add ffi gem
Add LED libraries and build script

Also included is a .gitignore to ignore the shared object libraries.
Use rake build_ext to build them yourself.
Add lodo ruby library file

Includes a module that uses ffi and the C library to control the
lights. Also includes a class that wraps the module to make
controlling the lights a little more pleasant and ruby-like.
Add wave example

This wave example displays "waves" of alternating color that move
down the LED strand.