Get or create logger (if it does not exist)

        @rtype: RootLogger

def get_logger():
        """Get or create logger (if it does not exist)

        @rtype: RootLogger
        """
        name = Logr.get_logger_name()
        if name not in Logr.loggers:
            Logr.configure_check()
            Logr.loggers[name] = logging.Logger(name)
            Logr.loggers[name].addHandler(Logr.handler)
        return Logr.loggers[name]