lib/redis.js
function(opts) {
    this._client = Promise.promisifyAll(redis.createClient(opts));
    if (opts.db) {
      this._client.selectAsync(opts.db);
    }
    this.redisOpts = opts;
  }
function(opts) {
    this._client = Promise.promisifyAll(redis.createClient(opts));
    if (opts.db) {
      this._client.selectAsync(opts.db);
    }
    this.redisOpts = opts;
  }
Initialize redis client
@param {Object} opts Options for creating the redis client