Removed redundant copying from Makefile.
Removed redundant copying from Makefile.

vivek425ster/pgmpy,kris-singh/pgmpy,khalibartan/pgmpy,khalibartan/pgmpy,pratyakshs/pgmpy,jhonatanoliveira/pgmpy,palashahuja/pgmpy,yashu-seth/pgmpy,kislayabhi/pgmpy,jhonatanoliveira/pgmpy,sandeepkrjha/pgmpy,palashahuja/pgmpy,ankurankan/pgmpy,anaviltripathi/pgmpy,abinashpanda/pgmpy,yashu-seth/pgmpy,pratyakshs/pgmpy,vivek425ster/pgmpy,abinashpanda/pgmpy,pgmpy/pgmpy,liquidmetal/pgmpy,kislayabhi/pgmpy,anaviltripathi/pgmpy,pgmpy/pgmpy,sandeepkrjha/pgmpy,ankurankan/pgmpy,liquidmetal/pgmpy,kris-singh/pgmpy