Internal Server Error でファイル添付ができていなかったのでパッチをベタ貼りします。
diff --git a/Gemfile b/Gemfile
index cbf5607..70da7dc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ group :default do
gem 'oauth', '~> 0.4'
gem 'json_pure', '~> 1.8'
gem 'addressable', '~> 2.3'
- gem 'memoize', '~> 1.3'
+ gem 'memoist', '~> 0.12'
gem 'ruby-hmac', '~> 0.4'
gem 'typed-array', '~> 0.1'
gem 'delayer', '~> 0.0'
diff --git a/core/mui/gtk_web_image_loader.rb b/core/mui/gtk_web_image_loader.rb
index ede1d6b..aaab5f6 100644
--- a/core/mui/gtk_web_image_loader.rb
+++ b/core/mui/gtk_web_image_loader.rb
@@ -3,7 +3,7 @@
miquire :core, 'serialthread', 'skin'
miquire :mui, 'web_image_loader_image_cache'
-miquire :lib, 'memoize', 'addressable/uri'
+miquire :lib, 'addressable/uri'
require 'net/http'
require 'uri'
require 'thread'
diff --git a/core/utils.rb b/core/utils.rb
index 99522f2..8f191b0 100644
--- a/core/utils.rb
+++ b/core/utils.rb
@@ -34,8 +34,8 @@ require File.join(File::dirname(__FILE__), 'miquire')
miquire :lib, 'lazy'
# すべてのクラスにメモ化機能を
-miquire :lib, 'memoize'
-include Memoize
+miquire :lib, 'memoist'
+include Memoist
# Environment::CONFROOT内のファイル名を得る。
# confroot(*path)