Peeper works like an FS watcher, only it doesn't break when inotify isn't available (or is overloaded)
It currently uses polling only with a customizable interval.
You may watch files and directories whether they exist or not.
Returns an object implementing the FSWatcher interface from node core. Only change events are emitted. This function will not throw an error.
Options are defaulted to {persistent: true, interval: 2003} which says
that the process will stay alive as long as the watcher is active, and files
will be polled for changes ever 2003ms.
Listener is a callback automatically attached to the watcher change event