This is an example OS X notifier that can be used with spook (a guard replacement - eg. watch for changes and run something). Clone this gist to:
~/.spook
like so:
cd ~
git clone https://gist.github.com/fc803fe80124a0fe1953.git ~/.spook/notifiers/osx
Also make sure you install "terminal-notifier" through homebrew or this won't work.
and you're good to go.