Mxnet should support forward and backward hooks

mxnet should support forward and backward hooks.
pytorch has these functions already.
I have finished an awsome end-2-end fixpoint finetuning algorithm based on hooks.

Could you please add this to github as a feature request: https://github.com/apache/incubator-mxnet/labels/Feature%20request and provide a specific example how you used it.

Thanks.

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ok, i will put it on the github.