Remove dummy triggers from Spice .pm only used for endpoint

//cc @yegg @russellholt @jagtalon 

With the fixes introduced by https://github.com/duckduckgo/duckduckgo/pull/52 we no longer need to use dummy triggers. This removes any dummy triggers and also cleans up the spice implementations. We've been using `nrj` and `$.getScript` in places to where `$.getJSON` is truly optimal. This fixes up (and simplifies) some Spice implementations so we no longer need to use multiple callback functions for a Single spice to function properly.

Guidebox is the clearest example. We were using two callbacks and awkwardly passed data between them by adding properties to functions. Using `$.getJSON` all we need is one callback function and the data can more easily be passed along now.