-------------
Released on April 23, 2013. Beta release.
* various bugfixed
* don't sys.exit on :meth:`Command.print_help` and :meth:`Command.print_version`
* add :class:`Option`, use :class:`Option` on :meth:`Command.option`
* remove the colorful message on :meth:`Logger.message`
* disable :meth:`Logger.verbose` log on :meth:`Logger.start` and :meth:`Logger.end`
* add **builtin.Command** and **builtin.Logger**
* Option parser has required and boolean flags, Option parser has default value
* record warn and error count on :class:`Logger`