Responses never terminate (ab dies with timeout error) (OS X)
Using latest jester and Apache bench and for some reason it thinks the requests timeout.  Perhaps we're not closing a socket properly or something?  It's 100% reproducible here and only with `httpbeast`.  `asynchttpserver` does not have the same issue.

```
nim c -d:release -r tests/example
...

INFO Jester is making jokes at http://0.0.0.0:5000
Starting 1 threads
```


```
ab -r -n 1000 -c 1000 http://0.0.0.0:5000/
This is ApacheBench, Version 2.3 <$Revision: 1826891 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 0.0.0.0 (be patient)
apr_pollset_poll: The timeout specified has expired (70007)
```

Seems to work fine in browser and with `curl`.  AB is receiving the responses (if I used `-v2`), but obviously something else is off.

Thoughts?