sersync2 chown 时崩溃

```
1. chown -R user:use/the watch path
2. 开启了inotify的 attrib 其他默认


报错退出信息:
terminate called after throwing an instance of 'terminate called recursively
std::out_of_range'


望修复, 由衷感谢sersync开发人员.
```

Original issue reported on code.google.com by `WJ0...@gmail.com` on 27 May 2014 at 6:08
