Merge pull request #13 from Cyan4973/dev

Dev
Merge pull request #17 from Cyan4973/dev

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Merge pull request #22 from Cyan4973/dev

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Merge pull request #23 from Cyan4973/dev

Dev
Merge branch 'frame' of https://github.com/Cyan4973/lz4 into frame
minor lz4frame API update : errorCodes & frameInfo