OzJS is a CommonJS Asynchronous Modules compatible implementation
blog post: http://www.limboy.com/2010/12/19/module-and-compiler-for-common-js/
slide in D2forum: http://www.slideshare.net/dexter_yy/js-6228773
CommonJS AsynchronousDefinition: http://wiki.commonjs.org/wiki/Modules/AsynchronousDefinition