Add a new option for md5 authentication: -U, --username=NAME. Fix help message.
Add a new option for md5 authentication: -U, --username=NAME.
Fix help message.

treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres