Perhaps its handy to make a readme.md file and show users where to put these files. Took me a couple minutes to locate it. On OSX the path is `/Applications/Blender/blender.app/Contents/Resources/BLENDER XXX/scripts/modules/rigutils` <img width="832" alt="screen shot 2018-09-19 at 15 15 52" src="https://user-images.githubusercontent.com/6923008/45775818-ef9ec280-bc1e-11e8-8338-146df989f59e.png">
Perhaps its handy to make a readme.md file and show users where to put these files. Took me a couple minutes to locate it.
On OSX the path is
/Applications/Blender/blender.app/Contents/Resources/BLENDER XXX/scripts/modules/rigutils