错误提示优化

 phantomjs_cdnurl=http://npm.taobao.org/mirrors/phantomjs
-registry=http://npm.yoho.cn
+registry=http://npm.yohops.com

@@ -80,7 +80,7 @@ class CdnCache extends Model {
             self._broadcast(`清理阿里云提交成功,RefreshTaskId:${res.RefreshTaskId}`)
         })
         .catch(function (err) {
-            self._broadcast(`清理阿里云失败:${err.response.body}`)
+            self._broadcast(`清理阿里云失败:${JSON.stringify(err.response.body)}`)
         });
 
     }