firstDayOfWeek does not matter

```
I have some problem with Date.js library. I use the russian culture settings.
First day of week is setted by 1. And it means, that my week should be since
Monday till Sunday. Monday should be the return vaue when i call:
Date.getDayNumberFromName('понедельник'); //Monday, it should return
0 and Date.getDayNumberFromName('воскресенье'); //Sunday, it should
return 6

and, of course, it should be actual to all weeks calculations. For example,
today (Sunday, 3 March), this code: Date.monday(), should return 25 February.
But it isn't so.

I've made example on my own host: http://sulla.ru/lab/
```

Original issue reported on code.google.com by `sullaro...@gmail.com` on 3 Mar 2013 at 3:25