Fix BatchNormalization in ResNet50
Fix BatchNormalization in ResNet50

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