watcher.go
func (w *Watcher) Stop() {
	if w.notify_chan != nil {
		close(w.notify_chan)
	}

	if w.add_chan != nil {
		close(w.add_chan)
	}
}
func (w *Watcher) Stop() {
	if w.notify_chan != nil {
		close(w.notify_chan)
	}

	if w.add_chan != nil {
		close(w.add_chan)
	}
}
// Stop listening for changes to the files.