add -S to avoid travis failure
add -S to avoid travis failure

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