Moving ITK superbuild to 4.5rc2

Change-Id: I9af35b2aed5863f2834bd62ccb8e4379e8398a5c
Updating Otsu baseline hashes for ITK4.5

Change-Id: I89ec3c17f34f04da45089ca0233df05d31eb313e
Merge topic 'SIMPLEITK-432_UpdateToITK4.5' into next

b279f76 Updating Otsu baseline hashes for ITK4.5
da190fd Moving ITK superbuild to 4.5rc2