将async包引进

package.json

@@ -14,6 +14,7 @@
     "dependencies": {
         "restify": "^4.0.3",
         "sequelize": "^3.13.0",
-        "tedious": "^1.13.1"
+        "tedious": "^1.13.1",
+        "async":"^2.1.4"
     }
 }