hoist up copywrite to top of file
first version of NPM packaging
use UMD to register module

https://github.com/umdjs/umd/blob/master/returnExportsGlobal.js

This helps implement #20 and fixes #24 (though Intl.min.js is not rebuilt).
Merge pull request #25 from drewfish/packaging

use UMD to register the module and setup node.js (NPM) packaging