adds _get_ancestor_of method in NaiveBayes
adds _get_ancestor_of method in NaiveBayes

liquidmetal/pgmpy,abinashpanda/pgmpy,abinashpanda/pgmpy,jhonatanoliveira/pgmpy,ankurankan/pgmpy,pgmpy/pgmpy,anaviltripathi/pgmpy,khalibartan/pgmpy,ankurankan/pgmpy,kris-singh/pgmpy,jhonatanoliveira/pgmpy,kris-singh/pgmpy,sandeepkrjha/pgmpy,khalibartan/pgmpy,sandeepkrjha/pgmpy,pgmpy/pgmpy,liquidmetal/pgmpy,anaviltripathi/pgmpy