func (c *Client) Auth(password string) (string, error) {
	var ret string
	err := c.command(
		&ret,
		[]byte("AUTH"),
		[]byte(password),
	)
	return ret, err
}
/*
Request for authentication in a password-protected Redis server. Redis can be
instructed to require a password before allowing clients to execute commands.
This is done using the requirepass directive in the configuration file.

http://redis.io/commands/auth
package redis
import (
	"errors"
	"fmt"
	"io"
	"menteslibres.net/gosexy/to"
	"strings"
)
func (c *Client) Append(key string, value interface{}) (int64, error) {
	var ret int64
	err := c.command(
		&ret,
		[]byte("APPEND"),
		[]byte(key),
		to.Bytes(value),
	)
	return ret, err
}