Update version 2.1.0 -> 2.2.0
Activate git ITK checkout and patching as with VTK.
Define itk tag correctly for the update target.
Use Itk 4.5.2
Update the version of ITK.
Remove hard-coded ITK and VTK versions
Patch ITK to remove rpath on Mac, patches also get applied when source is downloaded
Merge pull request #47 from ocommowi/itk-patch

Add ITK patch for Mac, solve bug in superproject
working on VP2HF's packaging