removing pep8 errors for fast marginalize bug#267
removing pep8 errors for fast marginalize bug#267

changes for fast marginalize method
anaviltripathi/pgmpy,pratyakshs/pgmpy,kris-singh/pgmpy,anaviltripathi/pgmpy,liquidmetal/pgmpy,pgmpy/pgmpy,vivek425ster/pgmpy,kris-singh/pgmpy,pratyakshs/pgmpy,khalibartan/pgmpy,jhonatanoliveira/pgmpy,khalibartan/pgmpy,sandeepkrjha/pgmpy,ankurankan/pgmpy,palashahuja/pgmpy,sandeepkrjha/pgmpy,abinashpanda/pgmpy,vivek425ster/pgmpy,liquidmetal/pgmpy,yashu-seth/pgmpy,ankurankan/pgmpy,abinashpanda/pgmpy,yashu-seth/pgmpy,jhonatanoliveira/pgmpy,pgmpy/pgmpy,palashahuja/pgmpy