Added a routine for making a Ring  (periodic lattice) and associated methods (bunch wrappers)
Added a routine for making a Ring  (periodic lattice) and associated methods (bunch wrappers)

PyORBIT-Collaboration/py-orbit,azukov/py-orbit,azukov/py-orbit,azukov/py-orbit,PyORBIT-Collaboration/py-orbit,PyORBIT-Collaboration/py-orbit