Update basic tutorial
Update basic tutorial

jnishi/chainer,ysekky/chainer,muupan/chainer,sinhrks/chainer,wkentaro/chainer,anaruse/chainer,ktnyt/chainer,okuta/chainer,jnishi/chainer,keisuke-umezawa/chainer,aonotas/chainer,hvy/chainer,okuta/chainer,kikusu/chainer,rezoo/chainer,ronekko/chainer,ktnyt/chainer,cupy/cupy,benob/chainer,niboshi/chainer,AlpacaDB/chainer,niboshi/chainer,chainer/chainer,keisuke-umezawa/chainer,t-abe/chainer,hvy/chainer,kiyukuta/chainer,pfnet/chainer,muupan/chainer,niboshi/chainer,jnishi/chainer,sinhrks/chainer,wkentaro/chainer,wkentaro/chainer,kikusu/chainer,hvy/chainer,ktnyt/chainer,truongdq/chainer,chainer/chainer,okuta/chainer,cupy/cupy,truongdq/chainer,jnishi/chainer,AlpacaDB/chainer,chainer/chainer,keisuke-umezawa/chainer,cupy/cupy,benob/chainer,okuta/chainer,niboshi/chainer,tkerola/chainer,cupy/cupy,hvy/chainer,cemoody/chainer,keisuke-umezawa/chainer,t-abe/chainer,chainer/chainer,kashif/chainer,wkentaro/chainer,delta2323/chainer,ktnyt/chainer