message and nodejs_notify integration

Not sure how to file this one, but it was mentioned that I should throw it here. After attending the NodeJS bof and having a couple conversations with beejeebus, I wrote a quick proof of concept that I think could easily be worked up to a nice contrib.

Essentially, by leveraging the message module in combination with the nodejs_notify module provided here, we can have custom messages fire in "real time" based on certain events. This gives us all the flexibility of message with a cool growl like display.

For example, you can configure message to log when people comment on a certain node or node type. The message could say something like "@user commented on %node." Typically this would be displayed in a view, as an "activity stream" type display, but with this module enabled it will instead be broadcast as a jGrowl notification.

This is admittedly pretty bare bones, but I'm hoping to add some configuration options in the very near future.

I've thrown the beginnings in a sandbox. Check it out and let me know what you think!