Support for NodeJS

[imp-dance]

It would be nice to have support for NodeJS for this package. I've done a tiny bit of research and it seems like there are two main problems currently:

• CustomEvent does not seem to be implemented in NodeJS. There is a thread about this here, and there seems to have been some progress here in the event module. Not sure how we'd go about using one or the other depending on context.
• To fire off a CustomEvent, we need an EventTarget. I'm not sure what the proper way of doing this in node is. Some more insight on this front would be great.

If anyone is willing to help out or want to submit a PR regarding this issue, I'm very much open to reviewing it.