Remove wscale option from Convolution2D
Remove wscale option from Convolution2D

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