add core.concatenate
add core.concatenate

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