Fix for make html
Fix for make html

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