Allow Spice without triggers (when using the module for another API endpoint)

Rebased onto master as the original branch was out of date.

Original PR: https://github.com/duckduckgo/duckduckgo/pull/52

cc// @yegg @russellholt @jagtalon @nilnilnil 
since website.com is an actual site, we should probably point this to somewhere else even if it's not actually used