Merge pull request #1 from sun-zhao/master

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Merge pull request #2 from sun-zhao/master

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Merge pull request #3 from sun-zhao/master

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Merge pull request #4 from sun-zhao/master

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Merge pull request #5 from sun-zhao/master

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Merge pull request #6 from sun-zhao/master

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Merge pull request #33 from wangjiamr/master

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