timrwood/moment — pull request #492 by aleafs (2012-11-02 12:34:05+00:00)
Title: fix bug of get week number of year

Sometimes, codes below got error result:

```javascript
moment().format('w')
```

test cases from here:
[http://en.wikipedia.org/wiki/ISO_week_date](http://en.wikipedia.org/wiki/ISO_week_date)