Add related link field for more information. (r-labs: #1339)
Update test code. (r-labs: #1339)
Merge branch 'dev' of https://github.com/akiko-pusu/redmine_banner into dev

* 'dev' of https://github.com/akiko-pusu/redmine_banner:
  Add related link field for more information. (r-labs: #1339)