添加一些对代码理解的注释

lib/plugins/acts_as_activity_provider/lib/acts_as_activity_provider.rb

@@ -24,6 +24,10 @@ module Redmine
 
       module ClassMethods
         def acts_as_activity_provider(options = {})
+          # Time 2015-01-31 13:54:34
+          # Author lizanle
+          # Description  mod.included_modules -> array
+          # 返回mod包含的 modules数组
           unless self.included_modules.include?(Redmine::Acts::ActivityProvider::InstanceMethods)
             cattr_accessor :activity_provider_options
             send :include, Redmine::Acts::ActivityProvider::InstanceMethods