Please add an option to create a pop-up notification at the end of a pomodoro

[Google Code Exporter]

I have all sounds turned off on the workstation that I run chromodoro on. It 
would be great to have an option to have a pop-up notification instead of an 
audible alarm.

Original issue reported on code.google.com by [e-mail] on 22 Nov 2011 at 4:02