Remove :all symbol from Mime::ALL

.all isn't a valid file extension, so it shouldn't used as a symbol.
This also makes Mime::ALL better match how */* is parsed from an Accept
header.

actionpack/lib/action_dispatch/http/mime_type.rb

@@ -315,7 +315,7 @@ class AllType < Type
     include Singleton
 
     def initialize
-      super "*/*", :all
+      super "*/*", nil
     end
 
     def all?; true; end

actionpack/test/controller/mime/respond_to_test.rb

@@ -158,6 +158,12 @@ def handle_any_any
     end
   end
 
+  def handle_any_with_template
+    respond_to do |type|
+      type.any { render "test/hello_world" }
+    end
+  end
+
   def all_types_with_layout
     respond_to do |type|
       type.html
@@ -572,6 +578,13 @@ def test_browser_check_with_any_any
     assert_equal "HTML", @response.body
   end
 
+  def test_handle_any_with_template
+    @request.accept = "*/*"
+
+    get :handle_any_with_template
+    assert_equal "Hello world!", @response.body
+  end
+
   def test_html_type_with_layout
     @request.accept = "text/html"
     get :all_types_with_layout