Add support for tls connections

[kHRISl33t]

https://github.com/Automattic/kue/blob/87d61503d3d9cc024633efc7611bd25551f0f87d/lib/redis.js#L28

Please add support for using 'rediss://... for the protocol in a redis_url. It will enable a TLS socket connection.

[kHRISl33t]

There is a way to provide rediss://:

const redis = require('redis');
const kue = require('kue');

const q = kue.createQueue({
  prefix: 'q',
  redis: {
    createClientFactory: () => redis.createClient(config.redis.connectionString, {tls: true}),
  },
});

With this its not throwing any errors and it can connect to ElastiCache Redis. Sorry for the rushed open issue, you guys can close it now.