Docker-only hosting compatibility

[mblaschke]

• Add ssh container (for data transfer)
• Add application container (for code/ loading)
• Move php.ini and other configurations back to docker/main/
• Add postfix
• Logrotate? or directly stdout http://serverfault.com/questions/599103/make-a-docker-application-write-to-stdout

[mblaschke]

Fixed in `feature/refactoring/