PROWL notification

I use Observium as a monitoring tool for my Linux servers, and i would love the funtion to be notified when a host went down.

With my little programming knowledge i modified the API, and made a PROWL notifcation solution. PROWL can send notifications to android and iOS devices.

I didn't polish the code, and might add some more functions in the future, like i would want to receive a notification when a host is up again.

For now it sends a notification with the content of which hostname went down, how many other host went down. The last poll time, the "went down" time, and the calculated mintues between those times.