Merge branch 'SIMPLEITK-585_UpdateToITK4.7' into release

* SIMPLEITK-585_UpdateToITK4.7:
  Update ITK superbuild to the official 4.7.0 release

Change-Id: I34e3d334ca231f457dfe6e0bb8f57f15df03cf2c
Merge branch 'release'

Change-Id: Icd8761e82bef9141eac07b24b80de5551574b5eb
Merge branch 'master' into next

Change-Id: Ib9fa7213d1a72f7d00636bcda2794ec00a4434a6