Added require for angular-drag-and-drop-lists in index.js

Author: Claudio Mezzasalma

index.js

@@ -3,6 +3,7 @@ require('angular-animate');
 require('angular-sanitize');
 require('angular-ui-bootstrap');
 require('lodash');
+require('angular-drag-and-drop-lists');
 require('patternfly/dist/js/patternfly-settings.min');
 require('./dist/angular-patternfly');
 module.exports = 'angular-patternfly';