Fix: Checkstyle
Fix: Ignore vagrant dir into CI
Fix: Ignore vagrant dir into CI

Conflicts:
	.travis.yml
Merge remote-tracking branch 'origin/3.5' into 3.6

Conflicts:
	.travis.yml
Merge remote-tracking branch 'origin/3.6' into develop

Conflicts:
	.travis.yml
Fix: phpunit
Fix: checkstyle
Fix: table declaration
Fix: regretion into trigger management
Fix: ON DELETE CASCADE is forbidden.
Fix: File for migration 3.5 to 3.6 was modified.