Simplify cmdline parsing

go/linguaevalia/linguaevalia.go

		os.Args[0])
}
func parseCommand() (string, []string) {
	if len(os.Args) == 1 {
		return "server", []string{}
	} else {
		return os.Args[1], os.Args[2:]
	}
}
var language = flag.String("l", "", "The language to use for code passed via stdin.")
var host = flag.String("h", "localhost", "The host to listen on.")
var port = flag.Int("p", 8000, "The port to listen on.")
func main() {
	cmd, args := parseCommand()
	flag.CommandLine.Parse(args)
	var cmd string
	if len(os.Args) == 1 {
		cmd = "server"
	} else {
		cmd = os.Args[1]
	}
	flag.Parse()
	switch cmd {
	case "server":