Improve the readability of config.show
Improve the readability of config.show

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