0.1.8:

 * added support for ConnectEx (via IOCPProactor)
 * added content-length checking and adding chunking boudaries when app returns
 wsgi.file_wrapper
 * added a option for sendfile_timeout to the wsgi server
 * added support for a threading.local-like object in cogen.core.coroutines.local
 * changed epoll and kqueue to use ONE-SHOT events
 * reworked the IOCPProactor
 * added a QtReactor for using cogen within a Qt app (unstable)
 