Put poly on npm

[unscriptable]

We just received ownership of the name "poly" on npm. Yay! The very generous previous owner would like us to include a pointer to the previous project "poly.shell" in our README so that any existing users can find the source code, if necessary.

Tasks:

• [x] convert to UMD (#30)
• [x] update README as per above (we should also update the package.json "description" to make it clear that there has been a change when viewing on npmjs.org or doing npm info poly)
• [ ] unpublish and re-publish poly to npm

After that, we should start investigating ES6 and other shims pertinent to node and Nashorn. One that I already know we'll want is a Promise shim. It seems obvious that we should consider using when.js's Promise shim for this.

@jaredcacurak: interested?

[unscriptable]

Here's the repo of the previous "poly": https://github.com/dvidelabs/poly.shell

[phated]

Whoa, this is an old issue. I can probably take a swing at the README/documentation stuff.

[unscriptable]

Thanks @phated!