ENH: Use GitHub for faster ITK repository downloads
ENH: Use GitHub for faster ITK repository downloads

Change-Id: Ib0d54977382e8857c1137a24239b13c75df81f29

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