Counts do not work

I try query 6 from http://mathias-kettner.de/checkmk_livestatus.html
GET services
Stats: state = 0
Stats: state = 1
Stats: state = 2
Stats: state = 3

like:

``` python
from mk_livestatus import Socket
s = Socket(('x.y.z.q', 50000))
q = s.services
q = q.filter('state = 1')
q = q.filter('state = 2')
q = q.filter('state = 3')
q.call()
```

result is empty array
