return queue for promise

src/jio.storage/erp5toerp5storage.js

@@ -155,6 +155,7 @@ var DATABASE = "erp5toerp5";
     indexedDB.deleteDatabase('jio:' + DATABASE);
     this._locale_jio_instance = jIO.createJIO({
       type: "replicate",
+      parallel_operation_amount: 10,
       query: spec.source_query,
       use_remote_post: true,
       conflict_handling: 1,
@@ -182,6 +183,7 @@ var DATABASE = "erp5toerp5";
     });
     this._remote_jio_instance = jIO.createJIO({
       type: "replicate",
+      parallel_operation_amount: 10,
       query: {
         query: 'portal_type: "' + spec.source_portal_type + '"'
       },
@@ -229,7 +231,7 @@ var DATABASE = "erp5toerp5";
 
   ERP5ToERP5Storage.prototype.repair = function () {
     var context = this;
-    RSVP.Queue()
+    return RSVP.Queue()
       .push(function () {
         return context._locale_jio_instance.repair();
       })