Publish to npm

[rich-clark]

The README suggests that to use the retrofill, developers should Copy the contents of uach-retrofill.js to the relevant location in your project. It would be great if it was possible for developers to install this via npm, since this is the canonical way of depending on JS libraries and ensures anyone using this library can easily keep the version they're using up to date.

[rowan-m]

Transferred to a module, so this is an easy enough step once things are cleaned up a little.