merge to new interface
GPF optimization with GBRT model
parameter tuning

run test:
java -cp ml.jar com.spbsu.ml.models.gpf.GPFGbrtOptimization
Now this compiles
parallel evaluation of gradient
speedup progress handler by caching Ensemble value
merge GPF Learning code
test for GPFGbrtOptimization, sessions from web user sessions
tests for GPFGbrtOptimization, sessions from web user sessions
read GPF pool
GATEWAY-672 Initial implementation for GPFLearn based of GPFViewport model. For the correct implementation need clicks