Great work! This looks to have come a long ways since I last looked at it!
Do you have benchmarks?
I've been working on a similar project just for decision tree learning [1]. I've been able to get performance just about equal to scikit learn which is the current fastest open implementation [2]. I can beat it in some cases with lots of binary features.
I'll see about including a compatibility layer for integration with golearn. I'm actually also currently squatting the golearn github org but will pass it off if you are interested.
[1] https://github.com/ryanbressler/CloudForest
[2] based on benchmarks here http://orbi.ulg.ac.be/handle/2268/170309