ENH: Bump Superbuild ITK version to 4.7.0.
ENH: Bump Superbuild ITK version to 4.7.0.

Change-Id: I849eb4d5887d5c6bbc9c7ba2890b0368bd277dcb

InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples