-r requirements.txt
http://downloads.sourceforge.net/project/pyasn1/pyasn1/0.1.8/pyasn1-0.1.8rc2.tar.gz?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fpyasn1%2Ffiles%2Fpyasn1%2F0.1.8%2F&ts=1426346728&use_mirror=heanet