Reformatting command-specific usage message

Signed-off-by: Dave Henderson <Dave.Henderson@ca.ibm.com>

main.go

@@ -32,6 +32,19 @@ Commands:
 Run '{{.Name}} COMMAND --help' for more information on a command.
 `
 
+var CommandHelpTemplate = `
+Usage: docker-machine {{.Name}}{{if .Flags}} [OPTIONS]{{end}} [arg...]
+
+{{.Usage}}{{if .Description}}
+
+Description:
+   {{.Description}}{{end}}{{if .Flags}}
+
+Options:
+   {{range .Flags}}{{.}}
+   {{end}}{{ end }}
+`
+
 func main() {
 	for _, f := range os.Args {
 		if f == "-D" || f == "--debug" || f == "-debug" {
@@ -41,6 +54,7 @@ func main() {
 	}
 
 	cli.AppHelpTemplate = AppHelpTemplate
+	cli.CommandHelpTemplate = CommandHelpTemplate
 	app := cli.NewApp()
 	app.Name = path.Base(os.Args[0])
 	app.Author = "Docker Machine Contributors"