base_spec_helper now defines configs that are universal, whereas spec_helper is for configs that are using DatabaseCleaner and Selenium. This means we can include the base_spec_helper in both the system test setup and the regular setup but separate the other configurations for each type.
In some cases the browser will try to load external files like fonts, Google maps JS, Stripe JS. This can cause network issues on slow connections and add a lot of unnecessary time to each test.
