use babel polyfill

migrations/api_v3/challenges.js

@@ -9,6 +9,7 @@
 console.log('Starting migrations/api_v3/challenges.js.');
 
 require('babel-register');
+require('babel-polyfill');
 
 var Bluebird = require('bluebird');
 var MongoDB = require('mongodb');

migrations/api_v3/challengesMembers.js

@@ -10,6 +10,7 @@
 console.log('Starting migrations/api_v3/challengesMembers.js.');
 
 require('babel-register');
+require('babel-polyfill');
 
 var Bluebird = require('bluebird');
 var MongoDB = require('mongodb');

migrations/api_v3/coupons.js

@@ -9,6 +9,7 @@
 console.log('Starting migrations/api_v3/coupons.js.');
 
 require('babel-register');
+require('babel-polyfill');
 
 var Bluebird = require('bluebird');
 var MongoDB = require('mongodb');

migrations/api_v3/emailUnsubscriptions.js

@@ -9,6 +9,7 @@
 console.log('Starting migrations/api_v3/unsubscriptions.js.');
 
 require('babel-register');
+require('babel-polyfill');
 
 var Bluebird = require('bluebird');
 var MongoDB = require('mongodb');

migrations/api_v3/groups.js

@@ -17,6 +17,7 @@
 console.log('Starting migrations/api_v3/groups.js.');
 
 require('babel-register');
+require('babel-polyfill');
 
 var Bluebird = require('bluebird');
 var MongoDB = require('mongodb');

migrations/api_v3/users.js

@@ -10,6 +10,7 @@
 console.log('Starting migrations/api_v3/users.js.');
 
 require('babel-register');
+require('babel-polyfill');
 
 var Bluebird = require('bluebird');
 var MongoDB = require('mongodb');