Added support for CommonJS Modules and Bower

I'm currently using this awesome Backbone add-on both in a node env and in browser. This PR makes it easier to integrate with node's package manager and web component manager bower.

For more information about Bower:

http://twitter.github.com/bower/


For more information about CommonJS Modules:

http://wiki.commonjs.org/wiki/Modules/1.1
https://npmjs.org/