Added missing copyright information.
Replaced hardcoded links to http://learningwebgl.com to the parent
directory.
Refactor shader source out of the .html file.
Refactored more stuff out of the .html file
Updated github remote
Updated shaderutil.js into OOP style.
Added syntax highlighter.
Refactored the shaders (vertex and fragment) and Javascript code
from all the lessons (except lesson13).