Cleanup Initializer and Tests

Mixing `app/` helpers once.

Simplify the tests' controllers, deferring logic to the default
`HighVoltage` controllers.

Author: seanpdoyle

lib/ember_cli/engine.rb

@@ -1,11 +1,9 @@
 module EmberCli
   class Engine < Rails::Engine
-    initializer "ember-cli-rails.rendering" do
+    initializer "ember-cli-rails.setup" do
       require "ember_cli/ember_controller"
       require "ember_cli/route_helpers"
-    end
 
-    config.to_prepare do
       ActionController::Base.helper EmberRailsHelper
     end
   end

spec/dummy/app/controllers/pages_controller.rb

@@ -1,4 +1,3 @@
 HighVoltage.configure do |config|
   config.layout = false
-  config.routes = false
 end

spec/dummy/config/initializers/high_voltage.rb

@@ -1,5 +1,5 @@
 Rails.application.routes.draw do
-  with_options controller: "pages", action: "show" do |app|
+  with_options controller: "high_voltage/pages", action: "show" do |app|
     app.mount_ember_app(
       "my-app",
       to: "/no-block",