document some workarounds for working with a recent ruby (2.3.p112 on
[booh] / www / themes /
drwxr-xr-x   ..
-rw-r--r-- 17 .htaccess
drwxr-xr-x - cardu
drwxr-xr-x - dark
drwxr-xr-x - gradient
drwxr-xr-x - sbs
drwxr-xr-x - simple