post replacement: don't send @mention dmails to replacer.

app/models/post_replacement.rb

@@ -90,7 +90,7 @@ class PostReplacement < ActiveRecord::Base
 
   module PresenterMethods
     def comment_replacement_message
-      "@#{creator.name} replaced this post with a new image:\n\n#{replacement_message}"
+      %("#{creator.name}":[/users/#{creator.id}] replaced this post with a new image:\n\n#{replacement_message})
     end
 
     def modaction_replacement_message

test/unit/post_replacement_test.rb

@@ -94,7 +94,11 @@ class PostReplacementTest < ActiveSupport::TestCase
 
         assert_not_nil(comment)
         assert_equal(User.system.id, comment.creator_id)
-        assert_match(/@#{@replacer.name} replaced this post/, comment.body)
+        assert_match(/replaced this post/, comment.body)
+      end
+
+      should "not send an @mention to the replacer" do
+        assert_equal(0, @replacer.dmails.size)
       end
     end