Displays a message to the user via the tray icon.
        
        :param      title   | <str>
                    message | <str>
                    icon    | <QtGui.QSystemTrayIcon.MessageIcon>
                    timeout | <int>

def showMessage(self,
                    title,
                    message,
                    icon=QtGui.QSystemTrayIcon.Information,
                    timeout=10000):
        """
        Displays a message to the user via the tray icon.
        
        :param      title   | <str>
                    message | <str>
                    icon    | <QtGui.QSystemTrayIcon.MessageIcon>
                    timeout | <int>
        """
        tray = self.trayIcon()
        if tray:
            tray.showMessage(title, message, icon, timeout)