Add unittest for dropout
Add unittest for dropout

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