make pip download work with vcs urls having the subdirectory option
make pip download work with vcs urls having the subdirectory option

xavfernandez/pip,rouge8/pip,atdaemon/pip,sigmavirus24/pip,natefoo/pip,pfmoore/pip,rouge8/pip,techtonik/pip,dstufft/pip,fiber-space/pip,benesch/pip,atdaemon/pip,rouge8/pip,pradyunsg/pip,xavfernandez/pip,RonnyPfannschmidt/pip,dstufft/pip,zvezdan/pip,atdaemon/pip,nthall/pip,natefoo/pip,RonnyPfannschmidt/pip,mindw/pip,sigmavirus24/pip,pypa/pip,benesch/pip,dstufft/pip,nthall/pip,pfmoore/pip,sbidoul/pip,techtonik/pip,mindw/pip,fiber-space/pip,nthall/pip,zvezdan/pip,xavfernandez/pip,benesch/pip,sigmavirus24/pip,RonnyPfannschmidt/pip,mindw/pip,techtonik/pip,sbidoul/pip,natefoo/pip,fiber-space/pip,zvezdan/pip,pradyunsg/pip,pypa/pip