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: Add EXCLUDE_FROM_ALL option to itk_module.

Change-Id: I89783f19e21d2ca25de7e9cdd36d126223b65c76
Merge topic 'yvvGaussian2'

2945f78 ENH: Remote module: GPU and CPU Smoothing recursive YVV Gaussian Filter