Update to v1.6.2
Update to v1.6.2

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