Made project creation synchronous.

frontend/src/js/dialog/wb-new-project-dialog.js

@@ -36,7 +36,7 @@ class WBNewProjectDialog extends Component {
           'owner_uuid': ownerUuid
         };
         makeArvadosRequest(arvHost, arvToken,
-          '/arvados/v1/groups?async=true', { 'method': 'POST',
+          '/arvados/v1/groups', { 'method': 'POST',
           'data': JSON.stringify(group),
           'expectedStatus': 202 }
         ).then(callback);