- continued upgrade of amf parser:
 * migrating bulk of the code to an "amf.js" class/file , that can be used both in workers
and main thread (ie , not THREE.js code in there)
 * progressively seperating out the three.js specific code with something more generic (see
above)
 * added custom shader files to be able to display 4 component colors (added alpha)
 * added "browserify-shader" dependency to be able to "require()" shader files
 * work in progress !