Support direct embed into HTML

[bryanbraun]

I noticed that this library is set up to support a commonJS interface (like Node and Webpack). It would be great if it also supported being direct embedded into HTML. Currently, attempting that results in errors like: Uncaught ReferenceError: exports is not defined

We could use something like returnExports from UMD which lets a module work with Node (CommonJS), AMD (e.g. RequireJS) and browser globals. Or we could simplify it by not supporting AMD.

Love this library and how simple it is!

[bryanbraun]

Oh! It looks like you already have a babel plugin for doing this in your dev task. We just need to add it to your build task to ensure it gets in the production build. I can do a PR for that.