ENH: Adding fancy new ICON
adding itkBinShrink as submodule
BinShrink CLI now using itkBinShrink itk external submodule
Only include the external BinShrink Module if ITK is before 4.5
ENH: Adding initial implementation of IASEM Import

Adding new CLI module to stream read large images from disk, and
perform binning and/or Region of interest extraction.

This new module takes a filename as input and loads it into
slicer. It is efficient and conservative with the memory usage.
ENH: Adding input test image

Adding IASEM data from: http://placid.nlm.nih.gov/folder/286, which
has been cropped to a smaller size in SimpleITK:
img[100:164,100:164,100:164]
adding more tests for IASEM import and baselines