Test and/or implement browser compatibility?

[unusualbob]

I don't use mongoose in the browser, but from the original issue in mongoose, there was a specific comment which mentioned browser support as a reason for wanting mongoose validation.

I have not tested this library to see if it will work in a browser.

Assuming it doesn't drastically change the complexity of this project it would be nice to offer that ability. If it is too complex, maybe consider just exposing enough functionality to allow a separate module to do the heavy lifting to make it browser compatible.