COMP: Provide Updates to BRAINSFit and DWIConvert

After the NAMIC meeting, several changes were made to address issues
with BRIANSFit and DWIConvert.
ENH: Update SimpleITK to be in sync with ITK

Recent additions for registration framework API changes
have been incorporated into recent versions of SimpleITK

Since ITK was updated, we should update SimpleITK to be
in sync with that version.