ENH: adding wrapping support for BinShrink

 From Insight Journal submission:
    http://hdl.handle.net/10380/3450

Change-Id: I3cf22c32c8fb1280ef11851112cdda8018dd57ce
Merge topic 'WrapITKAddBinShrink'

24bb133 ENH: adding wrapping support for BinShrink