Merge branch 'hotfix/7.3.6'

* hotfix/7.3.6:
  * Updated gems
Merge branch 'release/7.4.0'

* release/7.4.0:
  * Added Deploy to Heroku button * Updated gems * Updated html5shiv
* Repo-agnostic button
Merge branch 'hotfix/7.4.1' into develop

* hotfix/7.4.1:
  * Repo-agnostic button