COMP: Fixes the Python wrapping under OS 10.8.5

Changed the calls to Zero to use the ZeroValue() method. This allows to wrap ITK on OS X 10.8.5 (python)
See bug ITK-3229 on Jira

Change-Id: Ifd27e84e42b76cacae013ab4a25e38c524a5be1f
Merge topic 'FixPythonWrappingsOS1085'

d0c93f6f COMP: Fixes the Python wrapping under OS 10.8.5