Fix inspecting route redirections, closes #6369

This commit fixes route inspection in `rake routes`

Before:

  foo  /foo(.:format) :controller#:action"

After:

  foo  /foo(.:format)  Redirect (301)

actionpack/lib/action_dispatch/routing/redirection.rb

@@ -35,6 +35,10 @@ def call(env)
       def path(params, request)
         block.call params, request
       end
+
+      def inspect
+        "Redirect (#{status})"
+      end
     end
 
     class OptionRedirect < Redirect # :nodoc:

railties/lib/rails/application/route_inspector.rb

@@ -16,7 +16,7 @@ def rack_app(app = self.app)
           class_name = app.class.name.to_s
           if class_name == "ActionDispatch::Routing::Mapper::Constraints"
             rack_app(app.app)
-          elsif class_name !~ /^ActionDispatch::Routing/
+          elsif class_name == "ActionDispatch::Routing::Redirect" || class_name !~ /^ActionDispatch::Routing/
             app
           end
         end
@@ -67,7 +67,7 @@ def initialize
         @engines = Hash.new
       end
 
-      def format all_routes, filter = nil
+      def format(all_routes, filter = nil)
         if filter
           all_routes = all_routes.select{ |route| route.defaults[:controller] == filter }
         end

railties/test/application/route_inspect_test.rb

@@ -152,5 +152,14 @@ def test_rake_routes_dont_show_app_mounted_in_assets_prefix
       assert_no_match(/RackApp/, output.first)
       assert_no_match(/\/sprockets/, output.first)
     end
+
+    def test_redirect
+      output = draw do
+        match '/foo' => redirect("/bar")
+        match '/foo2' => redirect("/bar", status: 307)
+      end
+      assert_equal " foo  /foo(.:format)  Redirect (301)", output[0]
+      assert_equal "foo2  /foo2(.:format) Redirect (307)", output[1]
+    end
   end
 end