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Merge branch 'master' of https://github.com/shimat/opencvsharp

Update README.md

Merge pull request shimat#278 from shimat/hello_contrib

Hello contrib

cv::Ptr<T> bugfix

cv::Ptr<T> bugfix

Merge pull request shimat#227 from TheMetalMonkey/master

StereoCalibrate - Correct point type is Point3f not Point3d

updated nuget packages

fixed CvRTrees overload mistake

bundles new nuget for samples