Resolve "TMVA BDT wrapper"

Closes #42 (closed)

nnfwtbn/__init__.py

@@ -9,3 +9,4 @@ from nnfwtbn.model import CrossValidator, ClassicalCV, MixedCV, \
                           Normalizer, EstimatorNormalizer, \
                           HepNet
 from nnfwtbn.stack import Stack, McStack, DataStack
+from nnfwtbn.interface import TmvaBdt