BUG: Fix runtime bug with ITK_FUTURE_LEGACY_REMOVE

When ITK_FUTURE_LEGACY_REMOVE is used inconsistently in ITK and BRAINSTools
it causes very difficult to diagnose virtual function failures.  This patch
set fixes the problem by pushing the use of ITK_FUTURE_LEGACY_REMOVE into
ITKv4 so that it is mandated to be consistently used.
ENH: Initial support for HITACHI DWI Files
Merge pull request #27 from Chaircrusher/AddHitachiDWIConvert

ENH: Initial support for HITACHI DWI Files
ENH: Update ITK for ITK_REMOVE_FUTURE_LEGACY
ENH: Lower cmake minimium requirement to allow cmake 2.8.7

Many standard builds have cmake 2.8.7 distributed by default
so provide build against that version.
ENH: Update ANTS reference tag.
Merge pull request #28 from BRAINSia/ANTS_UPDATE

ENH: Update ANTS reference tag.

This is an update for ANTS with bug fixes to MALF from Nick Tustison.