Set loggers configuration according to the `logging` section
    of Docido configuration file.

    :param nameddict config:
      overrides Docido configuration

def set_loggers_from_config(config=None):
    """Set loggers configuration according to the `logging` section
    of Docido configuration file.

    :param nameddict config:
      overrides Docido configuration
    """
    config = config or app_config.logging
    for lname, lconfig in config.get('loggers', {}).iteritems():
        if 'level' in lconfig:
            level = getattr(logging, lconfig.level)
            assert isinstance(level, int)
            logger = logging.getLogger(lname)
            logger.setLevel(level)