mentions: include mentioner in subject line.

The template looks like this:

Subject:

    #{creator_name} mentioned you in a comment on post ##{post_id}

Body:

    @#{creator_name} mentioned you in a \"comment\":/posts/#{post_id}#comment-#{id} on post ##{post_id}:

    [quote]
    #{DText.excerpt(body, "@"+user_name)}
    [/quote]

app/logical/mentionable.rb

@@ -39,17 +39,17 @@ module Mentionable
   end
 
   def queue_mention_messages
-    title = self.class.mentionable_option(:title)
     from_id = read_attribute(self.class.mentionable_option(:user_field))
     text = strip_quote_blocks(read_attribute(self.class.mentionable_option(:message_field)))
-    bodies = {}
 
-    text.scan(DText::MENTION_REGEXP).each do |mention|
+    names = text.scan(DText::MENTION_REGEXP).map do |mention|
       mention.gsub!(/(?:^\s*@)|(?:[:;,.!?\)\]<>]$)/, "")
-      bodies[mention] = self.class.mentionable_option(:body).call(self, mention)
     end
 
-    bodies.each do |name, text|
+    names.uniq.each do |name|
+      body  = self.instance_exec(name, &self.class.mentionable_option(:body))
+      title = self.instance_exec(name, &self.class.mentionable_option(:title))
+
       Dmail.create_automated(to_name: name, title: title, body: body)
     end
   end