[R] switch order of LRN and pooling layer
[R] switch order of LRN and pooling layer

Original paper (section 3.5) performs local response normalization of relu.
hesseltuinhof/mxnet,hesseltuinhof/mxnet,hesseltuinhof/mxnet,hesseltuinhof/mxnet,hesseltuinhof/mxnet,hesseltuinhof/mxnet,hesseltuinhof/mxnet,hesseltuinhof/mxnet,hesseltuinhof/mxnet