added pyflakes to test-requirements after travis ci borked
added pyflakes to test-requirements after travis ci borked

asadoughi/quark,roaet/quark,insequent/quark,Cerberus98/quark,Cerberus98/quark,alanquillin/quark,rackerlabs/quark,roaet/quark,alanquillin/quark,rackerlabs/quark,lmaycotte/quark,asadoughi/quark,insequent/quark,lmaycotte/quark