flatiron/winston — pull request #120 by pphetra (2012-03-25 10:02:39+00:00)
Title: Timestamp function that add via winston.loggers.add did not cloned properly

If I config my logger like these.

```javascript
winston.loggers.add('dev', {\
file: {
level: 'info',
timestamp: function () {
return '111111111';
},
filename: '/tmp/dev.log'
},
});
```

when I access my custom logger. (via console)
```javascript
> winston.loggers.get('dev').transports.file.timestamp
{}
```