Add a Windows CI integration

[binki]

This project does not work on Windows. I think it would be great to use CI to try to improve portability, especially when for most developers getting access to the platform may be extra work (so developers don’t have to bother with trying to fix win32 support until after a CI build fails at which point they can boot up a VM or whatever).

Appveyor is a nice travis-like CI, if you are willing to integrate with Appveyor I would be willing to write an appveyor.yml as a PR. Please just request.

[rksm]

Thanks for the offer, if you like please add a config for appveyor. We are planning to fix things for windows but it will likely take a few days until we get to it. Issues is actually less windows and more npm's new module structure but we need to fix this anyway.