Add help output for the rb-site manage command.
Review Request #6367 — Created Sept. 23, 2014 and submitted
This includes some basic help output for rb-site's 'manage' command that
explains how to get the list of commands and execute them.
Ran
rb-site --help
and saw the help content.Note that we have no control over newlines, which is why the help text isn't
formatted any nicer.