Remove unused Configurable in Rails::Engine and Rails::Application. Remove unnecessary railties load path in cli [#5871 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

railties/lib/rails/application.rb

@@ -35,7 +35,6 @@ module Rails
   #
   class Application < Engine
     autoload :Bootstrap,      'rails/application/bootstrap'
-    autoload :Configurable,   'rails/application/configurable'
     autoload :Configuration,  'rails/application/configuration'
     autoload :Finisher,       'rails/application/finisher'
     autoload :Railties,       'rails/application/railties'

railties/lib/rails/cli.rb

@@ -5,9 +5,6 @@ require 'rails/script_rails_loader'
 # the rest of this script is not run.
 Rails::ScriptRailsLoader.exec_script_rails!
 
-railties_path = File.expand_path('../../lib', __FILE__)
-$:.unshift(railties_path) if File.directory?(railties_path) && !$:.include?(railties_path)
-
 require 'rails/ruby_version_check'
 Signal.trap("INT") { puts; exit }
 

railties/lib/rails/engine.rb

@@ -324,7 +324,6 @@ module Rails
   #   MyEngine::Engine.load_seed
   #
   class Engine < Railtie
-    autoload :Configurable,  "rails/engine/configurable"
     autoload :Configuration, "rails/engine/configuration"
 
     class << self