[ticket/11509] Fail on Travis CI if commit messages are improperly formatted.

PHPBB3-11509
Merge remote-tracking branch 'github-bantu/ticket/11509' into develop-olympus

* github-bantu/ticket/11509:
  [ticket/11509] Fail on Travis CI if commit messages are improperly formatted.
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11509] Fail on Travis CI if commit messages are improperly formatted.

Conflicts:
	.travis.yml