If the gconf var style/font/style be changed, this method
        will be called and will change the font style in all terminals
        open.

def fstyle_changed(self, settings, key, user_data):
        """If the gconf var style/font/style be changed, this method
        will be called and will change the font style in all terminals
        open.
        """
        font = Pango.FontDescription(settings.get_string(key))
        for i in self.guake.notebook_manager.iter_terminals():
            i.set_font(font)