Show gnome-pomodoro progress in a terminal window (mini window)

As gnome-pomodoro app does not have a mini-window feature, it's not possible to keep it on top of the screen. This may not be an issue for the gnome-panel extension users, but it is less than ideal for users outside of GNOME.
This Python script displays the remaining time in a terminal window based on the same D-Bus & GSettings mechanism used to communicate with the gnome-panel extension, as a workaround. This terminal window then can be resized and set to always on top, to stay aware of the current pomodoro session.

It requires dbus-python and Python bindings for Gio and Glib.