Make download utils safer and more flexible
Make download utils safer and more flexible

chainer/chainer,kiyukuta/chainer,chainer/chainer,hvy/chainer,ktnyt/chainer,okuta/chainer,chainer/chainer,hvy/chainer,delta2323/chainer,ktnyt/chainer,wkentaro/chainer,anaruse/chainer,okuta/chainer,jnishi/chainer,hvy/chainer,niboshi/chainer,keisuke-umezawa/chainer,cupy/cupy,wkentaro/chainer,tkerola/chainer,niboshi/chainer,cupy/cupy,cupy/cupy,jnishi/chainer,ysekky/chainer,okuta/chainer,keisuke-umezawa/chainer,ktnyt/chainer,wkentaro/chainer,hvy/chainer,aonotas/chainer,keisuke-umezawa/chainer,chainer/chainer,keisuke-umezawa/chainer,rezoo/chainer,cupy/cupy,kikusu/chainer,jnishi/chainer,pfnet/chainer,ronekko/chainer,ktnyt/chainer,niboshi/chainer,kikusu/chainer,wkentaro/chainer,okuta/chainer,niboshi/chainer,kashif/chainer,jnishi/chainer