Add Iterator interface
Add Iterator interface

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