some refactoring on categorical node rebuilding, hopefully fix freezing issue

[#74295478]
Merge pull request #41 from sanity/debug-quickdt-freezing-occasionally-74295478

some refactoring on categorical node rebuilding, hopefully fix freezing ...
hopefully resolve java8 issue
hopefully resolve java8 issue
try this version of the MSEScorer also
This is negating a negative, not what was intended I'm sure
bump version
Update README.md
improve naming
Merge branch 'master' of github.com:sanity/quickdt
resolved merge conflicts