ENH: Remote module: GPU and CPU Smoothing recursive YVV Gaussian Filter

GPU and CPU implementations (independent of each other) of Young & Van Vliet's smoothing recursive Gaussian filter.
Details in InsightJournal submission: http://hdl.handle.net/10380/3425

Change-Id: I89783f19e21d2ca25de7e9cdd36d126223b65c76
ENH: YVV remote module - Add EXCLUDE_FROM_ALL option to itk_module.

Change-Id: I439b64fc589f007f1feb8e48fb78d6443ba024fa
Merge topic 'yvvGaussian'

29e8b58 ENH: YVV remote module - Add EXCLUDE_FROM_ALL option to itk_module.
ef8069f ENH: Remote module: GPU and CPU Smoothing recursive YVV Gaussian Filter