More Ruby specific stuff (if 0)

```
In Ruby, 0 is true. It's a common mistake for Ruby developers. Furthermore, 
ActiveRecord introduces different behaviour based on the column type.


if 0 
  system("touch /tmp/owned")
end

```

Original issue reported on code.google.com by `louis.ny...@gmail.com` on 21 Sep 2012 at 2:08
