Moved to rails 4.0.1.

Gemfile

@@ -1,6 +1,6 @@
 source 'http://rubygems.org'
 
-gem 'rails', '4.0.0'
+gem 'rails', '4.0.1'
 gem 'rails-observers'
 gem 'activerecord-session_store'
 
@@ -16,8 +16,8 @@ gem 'json'
 group :assets do
 
 # preparation for rails 4
-  gem 'sass-rails',   '~> 4.0.0'
-  gem 'coffee-rails', '~> 4.0.0'
+  gem 'sass-rails',   '~> 4.0.1'
+  gem 'coffee-rails', '~> 4.0.1'
   gem 'uglifier'
 end
 
@@ -89,4 +89,7 @@ group :development, :test do
 #    gem 'em-websocket-client'
 end
 
+# to generate doc
+gem 'kramdown'
+
 gem 'puma'