add modaction helper

app/models/pool.rb

@@ -227,15 +227,15 @@ class Pool < ActiveRecord::Base
   end
 
   def create_mod_action_for_delete
-    ModAction.create(:description => "deleted pool ##{id} (name: #{name})")
+    ModAction.log("deleted pool ##{id} (name: #{name})")
   end
 
   def create_mod_action_for_undelete
-    ModAction.create(:description => "undeleted pool ##{id} (name: #{name})")
+    ModAction.log("undeleted pool ##{id} (name: #{name})")
   end
 
   def create_mod_action_for_destroy
-    ModAction.create(:description => "permanently deleted pool ##{id} name=#{name} post_ids=#{post_ids}")
+    ModAction.log("permanently deleted pool ##{id} name=#{name} post_ids=#{post_ids}")
   end
 
   def add!(post)