Add `sec` to Unix `cp` command
Add `sec` to Unix `cp` command

The :tumblr example includes a default security driver in `/sec/com`, so this commit updates the Unix `cp` command to recursively copy in `/sec` to the designated Urbit's `%examples` desk as well.

urbit/examples,keatondunsford/examples,keatondunsford/examples,urbit/examples