Add some tests on download.py
Add some tests on download.py

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