Added texel spacing adjustments to the opening and closing filters.
Experimented with direct image processing from disk using stb_image.c. 10X slower than traveling through UIImage, though.
Made header files public and incorporated the radius-3 Kuwahara filter with the project. Rolled back experiments with image file loading.
Updated the documentation for all of the new filters added in recent months.
prevent header files from being copied public
Merge pull request #883 from proth/master

fixes bug with header files in static library
Merge branch 'upstream_master'