Add an option to show only a tray icon

[ViBE-HU]

It would be good if users can see only a tiny icon on the tray if the IP checking is not as important or if their tray is already crowded. They still can check the dropdown menu.

An example/idea for the tray icon but with less grids in monochrome style to fit in Unity.

[bovender]

If only I knew how to do options in Python/Unity/Gnome... This little app was really just an adventure into that world, I'm more of a Ruby/PHP/C# person...