Removed geometry attribute from Species in rmgpy.rmg.model.
Removed geometry attribute from Species in rmgpy.rmg.model.

This is part of the effort to limit the use of the Geometry class to
within CanThermo only. In RMG the geometry attribute was simply ignored,
so there's no significant change involved here.

pierrelb/RMG-Py,comocheng/RMG-Py,nickvandewiele/RMG-Py,nickvandewiele/RMG-Py,comocheng/RMG-Py,KEHANG/RMG-Py,KEHANG/RMG-Py,enochd/RMG-Py,nyee/RMG-Py,faribas/RMG-Py,chatelak/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,faribas/RMG-Py,enochd/RMG-Py,chatelak/RMG-Py