Changed settings to use strings for true/false instead of boolean.

The rails cache seems to have an issue with returning a boolean false.
The value comes back as nil instead of false.

I found one reference to this, but it still seems to be broken.

https://rails.lighthouseapp.com/projects/8994/tickets/1830-railscachefetch-does-not-work-with-false-boolean-as-cached-value