Add delete to middleware stack proxy.

railties/lib/rails/configuration.rb

@@ -28,6 +28,10 @@ def use(*args, &block)
         @operations << [:use, args, block]
       end
 
+      def delete(*args, &block)
+        @operations << [:delete, args, block]
+      end
+
       def merge_into(other)
         @operations.each do |operation, args, block|
           other.send(operation, *args, &block)

railties/test/application/middleware_test.rb

@@ -57,6 +57,12 @@ def app
       assert !middleware.include?("ActionDispatch::Static")
     end
 
+    test "can delete a middleware from the stack" do
+      add_to_config "config.middleware.delete ActionDispatch::Static"
+      boot!
+      assert !middleware.include?("ActionDispatch::Static")
+    end
+
     test "removes show exceptions if action_dispatch.show_exceptions is disabled" do
       add_to_config "config.action_dispatch.show_exceptions = false"
       boot!

railties/test/isolation/abstract_unit.rb

@@ -232,7 +232,7 @@ class Test::Unit::TestCase
     require_environment = "-r #{environment}"
   end
 
-  `#{Gem.ruby} #{require_environment} #{RAILS_FRAMEWORK_ROOT}/bin/rails #{tmp_path('app_template')}`
+  `#{Gem.ruby} #{require_environment} #{RAILS_FRAMEWORK_ROOT}/bin/rails new #{tmp_path('app_template')}`
   File.open("#{tmp_path}/app_template/config/boot.rb", 'w') do |f|
     if require_environment
       f.puts "Dir.chdir('#{File.dirname(environment)}') do"