add test of issue id in sending mail when issue is created by mail (#17078)

git-svn-id: http://svn.redmine.org/redmine@13195 e93f8b46-1217-0410-a6f0-8f06a7374b81
Gemfile: update builder version >= 3.0.4 (#17309)

git-svn-id: http://svn.redmine.org/redmine@13196 e93f8b46-1217-0410-a6f0-8f06a7374b81