Add noauth support

[stanleybz]

Just adding the NOAUTH Authentication support to Redis connection when creating new object

e.g.

new RedisSMQ( {
    host: process.env.REDIS_HOST, 
    port: process.env.REDIS_PORT,
    no_auth: process.env.REDIS_NO_AUTH_PW, 
    ns: "rsmq"
} )

[stanleybz]

#70