I add a new option in tinymce.yml for user to add custom skin. This will also copy assets special in tinymce.yml
to 'rails/root/public/assets/tinymce/'
If your skins/plugins are in your asset pipeline under tinymce/ (and set to be precompiled), then this shouldn't be necessary. See the README section "Custom Plugins & Skins".
I add a new option in tinymce.yml for user to add custom skin. This will also copy assets special in tinymce.yml to 'rails/root/public/assets/tinymce/'