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prepare release 1.0.27

Merge pull request swagger-api#912 from swagger-api/prepare-release-1…

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Merge pull request swagger-api#872 from swagger-api/prepare-release-1…

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prepare release 1.0.25

Merge pull request swagger-api#830 from swagger-api/prepare-release-1…

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prepare release 1.0.24

Merge pull request swagger-api#786 from swagger-api/prepare-release-1…

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prepare release 1.0.23

Merge pull request swagger-api#767 from swagger-api/prepare-release-1…

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Merge pull request swagger-api#735 from swagger-api/prepare-release-1…

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prepare release 1.0.21

Merge pull request swagger-api#681 from swagger-api/prepare-release-1…

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prepare release 1.0.20

Merge pull request swagger-api#635 from swagger-api/prepare-release-1…

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Merge pull request swagger-api#609 from swagger-api/prepare-release-1…

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prepare release 1.0.18