Fix name check of added extension
Fix name check of added extension

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