Steven Degutis's assert disappeared but here's a fork of it

Hi Sam,
I was wondering if you intend for go.fsevents to be open source, and if so, if you would mind [choosing a license](http://choosealicense.com/) for it.

More to the point, I was wondering if you would be interested in helping [add FSEvents to fsnotify](https://github.com/howeyc/fsnotify/issues/54).
Thanks, Nathan.