ENH: Update ITKv4 to lastest version.
ENH: Update simpleITK for clang
ENH: Update with json parsing code form Matt.
ENH: Update DWI processing code.
ENH: Updating to use pre-patched SWIG 2.0.11-1

The downloads on the midas server have been pre-patched to avoid
maintaining multiple scripts which patch, and containing SWIG code.