Merge remote-tracking branch 'origin/master'

Author: nzc

README.md

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 # dnn_ctr
 The framework to deal with ctr problem
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+details: https://zhuanlan.zhihu.com/p/32885978
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+FNN's introduction and api: https://zhuanlan.zhihu.com/p/33045184
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+PNN's introduction and api: https://zhuanlan.zhihu.com/p/33177517
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+DeepFM's introduction and api: https://zhuanlan.zhihu.com/p/33479030
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+AFM's introduction and api: https://zhuanlan.zhihu.com/p/33540686
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+NFM's introduction and api: https://zhuanlan.zhihu.com/p/33587540
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+DCN's introduction and api: https://zhuanlan.zhihu.com/p/33619389