fixed re_reader content_len=None bug resulting in stopping after first bufferful.
fixed re_reader content_len=None bug resulting in stopping after first bufferful.

ktkt2009/disco,scrapinghub/disco,pavlobaron/disco_playground,oldmantaiter/disco,mozilla/disco,beni55/disco,beni55/disco,ktkt2009/disco,mwilliams3/disco,mozilla/disco,pooya/disco,beni55/disco,mozilla/disco,mwilliams3/disco,mwilliams3/disco,discoproject/disco,discoproject/disco,seabirdzh/disco,ErikDubbelboer/disco,pombredanne/disco,oldmantaiter/disco,oldmantaiter/disco,beni55/disco,pooya/disco,ktkt2009/disco,ErikDubbelboer/disco,pavlobaron/disco_playground,pombredanne/disco,simudream/disco,ktkt2009/disco,scrapinghub/disco,pombredanne/disco,seabirdzh/disco,seabirdzh/disco,beni55/disco,simudream/disco,pavlobaron/disco_playground,oldmantaiter/disco,pooya/disco,ErikDubbelboer/disco,seabirdzh/disco,discoproject/disco,ErikDubbelboer/disco,scrapinghub/disco,mozilla/disco,mwilliams3/disco,pombredanne/disco,pooya/disco,discoproject/disco,discoproject/disco,simudream/disco,ErikDubbelboer/disco,simudream/disco,pavlobaron/disco_playground,scrapinghub/disco,ktkt2009/disco,pombredanne/disco,seabirdzh/disco,simudream/disco,oldmantaiter/disco,mwilliams3/disco