Support for default command when using subcommands about cli

[codegangsta]

This can be done by setting Action on the cli.App instance. Here is a snippet from the NewApp() function in the source where we set the default action to the help command:

func NewApp() *App {
    return &App{
        Name:    os.Args[0],
        Usage:   "A new cli application",
        Version: "0.0.0",
        Action:  helpCommand.Action,
    }
}

[maxekman]

Excellent, didn't think about that!