ENH: Bumped ITKv4 tag to include latest performance improvements.
ENH: Bump SimpleITK in preparation for registration meeting.
COMP: update TestData/BCDTest_acLowerBound_standard.nii.gz.md5
COMP: Update Baseline MD5 for BCD tests
COMP: More BCDTest md5 updates
COMP: update MD5 for BCDTest
COMP: fixed some testing md5 files
ENH: Remove useExplicitPDFDerivativesMode flag from BRAINSFit

This option is not used in ITKv4 optimizers. There is no need to set
that; however, this flag is not removed from the xml file to keep
backward compatibility.
WIP: make some changes
WIP: add flag to use warping
WIP: add a func to convert image to mask
WIP: final mask warping compiles