new_contents: """
  Utility that allows updating existing traveler instances with keys that are now defined in the form.
  
  Requires a python environment with pymongo installed.
  """
  
  import os
  import pprint
  
  from pymongo import MongoClient
  
  try:
  	mongo_host = os.environ['MONGO_SERVER_ADDRESS']
  	mongo_port = os.environ['MONGO_SERVER_PORT']
  	mongo_port = int(mongo_port)
  	mongo_user = os.environ['MONGO_TRAVELER_USERNAME']
  	mongo_pass_dir = os.environ['MONGO_TRAVELER_PASSWD_FILE']
  except KeyError, er:
  	print 'Missing Keys Error: %s' % er
  	print 'Please define environment variables: MONGO_SERVER_ADDRESS, MONGO_SERVER_PORT, MONGO_TRAVELER_USERNAME, MONGO_TRAVELER_PASSWD_FILE'
  	print 'Alternatively if you use traveler support mongo db, you can source etc/mongo-configuration.sh'
  
  	exit(1)
  
  
  f = open(mongo_pass_dir, 'r')
  mongo_pass = f.readline()
  mongo_pass = mongo_pass.rstrip('\n')
  
  mongo_url = "mongodb://%s:%s@%s:%s" % (mongo_user, mongo_pass, mongo_host, mongo_port)
  
  client = MongoClient(host=mongo_host, port=mongo_port, username=mongo_user, password=mongo_pass, authSource="traveler")
  
  traveler_db = client['traveler']
  forms_col = traveler_db['forms']
  travelers_col = traveler_db['travelers']
  
  
  forms = forms_col.find()
  
  for form in forms:
  	print '\n**************************************************************\n'
  	summary_information = {}
  
  	form_id = form['_id']
  
  	summary_information['form'] = form_id
  	summary_information['travelers'] = []
  
  	travelers = travelers_col.find({'referenceForm': form_id})
  
  	labels = None
  	key_map = None
  
  	if 'labels' in form:
  		labels = form['labels']
  	if 'mapping' in form:
  		key_map = form['mapping']
  
  	for traveler in travelers:
  		summary_traveler = {}
  
  		traveler_id = traveler['_id']
  		summary_traveler['traveler'] = traveler_id
  		summary_traveler['adding_keys'] = False
  		summary_traveler['adding_labels'] = False
  
  		html = traveler['forms'][0]['html']
  
  		new_key_map = {}
  		new_labels = {}
  
  		if key_map is not None:
  			if 'mapping' not in traveler:
  				for key in key_map:
  					input_id = key_map[key]
  
  					if html.__contains__(input_id):
  						new_key_map[key] = input_id
  
  		if labels is not None:
  			if 'labels' not in traveler:
  				for input_id in labels:
  					if html.__contains__(input_id):
  						new_labels[input_id] = labels[input_id]
  
  		if new_key_map or new_labels:
  			update_fields = {}
  			if new_key_map:
  				summary_traveler['adding_keys'] = True
  				update_fields['mapping'] = new_key_map
  
  			if new_labels:
  				summary_traveler['adding_labels'] = True
  				update_fields['labels'] = new_labels
  
  			update_doc = {'$set': update_fields}
  			travelers_col.update_one({'_id': traveler_id}, update_doc)
  
  		summary_information['travelers'].append(summary_traveler)
  
  	pprint.pprint(summary_information)
  
subject: Add a script that will allow updating traveler instances with labels and keys. Closes #109