Updating IASEM extension

8a1250c Adding test for SpaceAwareCurvatureDiffusion CLI module
bb12736 Adding basic test for BinShrink CLI module
94a759e SimpleITK is now required.
9157242 Remove top-level Testing directory.
Merge pull request #387 from blowekamp/udpate-IASEM

Updating IASEM extension