Minimizes complexity in experimental loader

[bryanwoods]

• Get some of that sweet sweet 4.0 Code Climate goodness

[oggy]

Hmm, I think I find this less readable.

Part of it is the name updated_active_experiments doesn't sound like it modifies anything. More generally I think breaking up the methods like this clouds the structure of what the loader is doing (creating, updating, removing). Perhaps there's a way to refactor this to maintain the single level of abstraction principle?