Added missing DateString type in loopback index

index.js

@@ -25,4 +25,5 @@ loopback.Remote = require('loopback-connector-remote');
  */
 
 loopback.GeoPoint = require('loopback-datasource-juggler/lib/geo').GeoPoint;
+loopback.DateString = require('loopback-datasource-juggler/lib/date-string');
 loopback.ValidationError = loopback.Model.ValidationError;

test/loopback.test.js

@@ -46,6 +46,7 @@ describe('loopback', function() {
         'Checkpoint',
         'Connector',
         'DataSource',
+        'DateString',
         'Email',
         'GeoPoint',
         'KeyValueModel',