Add NumPy installation to CI
Add NumPy installation to CI

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