Merge branch 'reference_merge_request_in_commit_message' into 'master'

Add reference to the merge request in the default merge request commit message

This adds a link to the merge request to the merge request commit.

If merge requests are used for code review, the merge in git is now linked to the code review.

See http://feedback.gitlab.com/forums/176466-general/suggestions/6088000-in-the-default-merge-request-commit-message-add-a

CHANGELOG

@@ -7,6 +7,7 @@ v 7.1.0
   - Add @all mention for comments
   - Dont show reply button if user is not signed in
   - Expose more information for issues with webhook
+  - Add a mention of the merge request into the default merge request commit message
 
 v 7.0.0
   - The CPU no longer overheats when you hold down the spacebar

app/models/merge_request.rb

@@ -293,6 +293,8 @@ class MergeRequest < ActiveRecord::Base
     message << title.to_s
     message << "\n\n"
     message << description.to_s
+    message << "\n\n"
+    message << "See merge request !#{iid}"
     message
   end