Francisco Jose CHAVES

In the following drawings, green shapes are `mp1` and magenta shape `mp2`, the expected result is `mp2` shape(s) without `mp1` parts  Maybe this drawing is better: 

The case of the issue now is working, but I have a new one that doesn't. I will put here when I extract the coordinates. Thanks

I made pull request #4 with a test file that gets the errors that I found in the library

Hi, do you can run the tests?