Updating towards ITK 4.6 with master on 6/20/14

Change-Id: I25a6346823a4a97214b20fa2357be6e3f5ae67a3
Merge topic 'SIMPLEITK-543_UpgradeITKTowards4.6' into next

26714631 Updating towards ITK 4.6 with master on 6/20/14