enhanced attributes for sakuracloud volume archive

lib/fog/sakuracloud/models/volume/archive.rb

@@ -7,6 +7,8 @@ module Fog
 
         identity :id, :aliases => 'ID'
         attribute :name, :aliases => 'Name'
+        attribute :sizemb, :aliases => 'SizeMB'
+        attribute :plan, :aliases => 'Plan'
 
       end
     end

lib/fog/sakuracloud/requests/volume/list_archives.rb

@@ -25,11 +25,17 @@ module Fog
             {"Index"=>0,
               "ID"=>112500514887,
               "Name"=>"CentOS 5.10 64bit (基本セット)",
-              "Availability"=>"available"},
+              "Availability"=>"available",
+              "SizeMB"=>20480,
+              "Plan"=>{"ID"=>2, "StorageClass"=>"iscsi1204", "Name"=>"標準プラン"}
+            },
             {"Index"=>1,
               "ID"=>112500571575,
               "Name"=>"CentOS 6.5 64bit (基本セット)",
-              "Availability"=>"available"}
+              "Availability"=>"available",
+              "SizeMB"=>102400,
+              "Plan"=>{"ID"=>2, "StorageClass"=>"iscsi1204", "Name"=>"標準プラン"}
+            }
             ]
           }
           response

tests/sakuracloud/requests/volume/archives_tests.rb

@@ -4,7 +4,9 @@ Shindo.tests('Fog::Volume[:sakuracloud] | list_archives request', ['sakuracloud'
   @archive_format = {
     'Index'        => Integer,
     'ID'           => Integer,
-    'Name'         => String
+    'Name'         => String,
+    'SizeMB'       => Integer,
+    'Plan'         => Hash
   }
 
   tests('success') do