tree ea0df52969a988d1dc83687340a7698ce55d51ce
parent d47216cd17848d55a33e6f651cbe408243ed55b8
author Ian Lewis <ianlewis@google.com> 1557331503 +0900
committer Andrew Jackura <ajackura@google.com> 1557331503 -0700

Allow users to override default help behavior. (#23)

- CommandGroup is now public.
- Commander and CommandGroup name is accessible by Name()
- Commander, CommandGroup, and Command explations are now printed by
  overridable functions set on the Commander.
- Subcommands are visitable by the VisitCommands() method.
- Command groups are visitable by the VisitGroups() method.
- Important flags are visitable by the VisitAllImportant() method.
- Top level flags are visitable by the VisitAll() method.