Remove unnecessary numpy install
Remove unnecessary numpy install

ktnyt/chainer,keisuke-umezawa/chainer,niboshi/chainer,keisuke-umezawa/chainer,ktnyt/chainer,hvy/chainer,jnishi/chainer,wkentaro/chainer,jnishi/chainer,chainer/chainer,chainer/chainer,hvy/chainer,hvy/chainer,chainer/chainer,wkentaro/chainer,okuta/chainer,niboshi/chainer,pfnet/chainer,chainer/chainer,okuta/chainer,niboshi/chainer,jnishi/chainer,tkerola/chainer,keisuke-umezawa/chainer,wkentaro/chainer,jnishi/chainer,wkentaro/chainer,ktnyt/chainer,keisuke-umezawa/chainer,ktnyt/chainer,okuta/chainer,okuta/chainer,hvy/chainer,niboshi/chainer