add numpy/cupy compatible ufuncs in chainer
add numpy/cupy compatible ufuncs in chainer

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