DocumentDB node.js SDK not passing continuation token properly on query

.gitignore

node_modules

app.js

var DocumentDBClient = require('documentdb').DocumentClient;
var DocDbUtils = require('./DocDbUtils');
var config = {}

config.host = process.env.HOST || "";
config.authKey = process.env.AUTH_KEY || "";
config.databaseId = "";
config.collectionId = "";

var docDbClient = new DocumentDBClient(config.host, {
    masterKey: config.authKey
});

var collection;
var database;

var init = function(callback){
        DocDbUtils.getOrCreateDatabase(docDbClient, config.databaseId, (err, db) => {
            if (err && callback) {
                callback(err);

            } else {
                database = db;
                DocDbUtils.getOrCreateCollection(docDbClient, database._self, config.collectionId, (err, coll) => {
                    if (err && callback) {
                        callback(err);

                    } else {
                        collection = coll;
                        callback();
                    }
                });
            }
        });
    };

init(function(){   
    
    var queryDocuments = function(query, opts, callback){
    
        console.log("Querying: "+ query.query);
        console.log("Continuation: "+ opts.continuation);
        var iterator = docDbClient.queryDocuments(collection._self, query, opts)

        var resultCallback = function(error, results, resultArray){
            if(error)
                throw error;
            
            console.log("got "+results.length+" results, continuation token " + iterator.continuation);
            console.log("id of first item: "+results[0].id);
            if(callback)
                callback(iterator.continuation);
        }
        
        iterator.executeNext(resultCallback); 
    }

    var querySpec = {
        query: 'SELECT * FROM images i ORDER BY i._ts DESC'
    };
     
    var options = {
        maxItemCount: 1
    };
    
    queryDocuments(querySpec, options, function(continuation){
        console.log("")
        console.log("2nd query:")
        
        options.continuation = continuation;
        queryDocuments(querySpec, options);
    });
});

DocDbUtils.js

var DocDBUtils = {
    getOrCreateDatabase: function (client, databaseId, callback) {
        var querySpec = {
            query: 'SELECT * FROM root r WHERE r.id=@id',
            parameters: [{
                name: '@id',
                value: databaseId
            }]
        };

        client.queryDatabases(querySpec).toArray(function (err, results) {
            if (err) {
                callback(err);

            } else {
                if (results.length === 0) {
                    var databaseSpec = {
                        id: databaseId
                    };

                    client.createDatabase(databaseSpec, function (err, created) {
                        callback(null, created);
                    });

                } else {
                    callback(null, results[0]);
                }
            }
        });
    },

    getOrCreateCollection: function (client, databaseLink, collectionId, callback) {
        var querySpec = {
            query: 'SELECT * FROM root r WHERE r.id=@id',
            parameters: [{
                name: '@id',
                value: collectionId
            }]
        };             

        client.queryCollections(databaseLink, querySpec).toArray(function (err, results) {
            if (err) {
                callback(err);

            } else {        
                if (results.length === 0) {
                    var collectionSpec = {
                        id: collectionId
                    };

                    var requestOptions = {
                        offerType: 'S1'
                    };

                    client.createCollection(databaseLink, collectionSpec, requestOptions, function (err, created) {
                        callback(null, created);
                    });

                } else {
                    callback(null, results[0]);
                }
            }
        });
    }
};

module.exports = DocDBUtils;

package.json

{
  "name": "documentdb-node",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "dependencies": {
    "documentdb": "^1.5.5"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}