Redirect v28/kolmogorov13 to v28/takhanov13

We need this in the `.htaccess` file:

```
Redirect 301 /proceedings/papers/kolmogorov13.html http://jmlr.org/proceedsings/papers/takhanov13.html
Redirect 301 /proceedings/papers/kolmogorov13.pdf http://jmlr.org/proceedsings/papers/takhanov13.pdf
```

Currently both the abstract page and PDF for both entries are available. Once the redirection is set up we should remove the `kolmogorov13` entries.
