Avoid clashing with main ApplicationController

The `ApplicationController` of the hosting (a.k.a. main_app) application is being loaded instead of the `JasmineRails::ApplicationController`.

I detect the issue because on the main_app `ApplicationController` route url helpers are called. In the context of the Engine those fail. The experienced behavior is that a 404 is returned due to the `ActionController::RoutingError`.