Allow in-place to_gpu
Allow in-place to_gpu

kashif/chainer,muupan/chainer,elviswf/chainer,hvy/chainer,AlpacaDB/chainer,hidenori-t/chainer,aonotas/chainer,sou81821/chainer,ktnyt/chainer,niboshi/chainer,chainer/chainer,hvy/chainer,jnishi/chainer,kikusu/chainer,anaruse/chainer,okuta/chainer,jfsantos/chainer,chainer/chainer,minhpqn/chainer,niboshi/chainer,woodshop/chainer,cupy/cupy,kuwa32/chainer,ttakamura/chainer,okuta/chainer,niboshi/chainer,benob/chainer,cupy/cupy,chainer/chainer,1986ks/chainer,cupy/cupy,yanweifu/chainer,wkentaro/chainer,pfnet/chainer,ktnyt/chainer,keisuke-umezawa/chainer,tigerneil/chainer,sinhrks/chainer,ttakamura/chainer,keisuke-umezawa/chainer,wavelets/chainer,wkentaro/chainer,muupan/chainer,bayerj/chainer,hvy/chainer,cemoody/chainer,woodshop/complex-chainer,tscohen/chainer,kiyukuta/chainer,chainer/chainer,ktnyt/chainer,okuta/chainer,nushio3/chainer,sinhrks/chainer,keisuke-umezawa/chainer,rezoo/chainer,jnishi/chainer,niboshi/chainer,okuta/chainer,ronekko/chainer,ktnyt/chainer,jnishi/chainer,Kaisuke5/chainer,ysekky/chainer,wkentaro/chainer,kikusu/chainer,tereka114/chainer,truongdq/chainer,keisuke-umezawa/chainer,masia02/chainer,nushio3/chainer,ytoyama/yans_chainer_hackathon,wkentaro/chainer,umitanuki/chainer,cupy/cupy,tkerola/chainer,benob/chainer,laysakura/chainer,truongdq/chainer,ikasumi/chainer,t-abe/chainer,delta2323/chainer,AlpacaDB/chainer,jnishi/chainer,hvy/chainer,t-abe/chainer