When a tcp_closed or ssl_closed message is handled while ibrowse is
trying to send a request to a worker, ibrowse would incorrectly return a
req_timedout message, when, in fact, the request had not even been
handled.

This patch attempts to avoid that race condition by signalling tcp or
ssl closed messages back to ibrowse differently than a normal exit.

I fixed the documentation errors in order to get them to build I made
a cursory check through the source to ensure that they were correct
and it seems like they are so I submit this patch.

Typically used to specify non-default, garbage collection options.

being deleted which led to the node not being able to create
               any more ETS tables if queries were made to many number of
               webservers. ibrowse now deletes the ETS table it creates once the
               last connection to a webserver is dropped.
               Reported by Seth Falcon.
             * Spurious data being returned at end of body in certain cases of
               chunked encoded responses from the server.
               Reported by Chris Newcombe.