Working on cropping
Merge branch 'refs/heads/develop'
Update README.md
Adding test
Adding a better sample image
Refactoring, improving examples and adding the feature of rendering image with catransform3d
Merge branch 'master' of github.com:hfossli/AGGeometryKit
Merge branch 'refs/heads/master' into develop
Merge branch 'refs/heads/demo_improvements' into develop