Test compose files for 5.6 and 7.1

boilerplates/php.dev.boilerplate/docker-compose.yml

php/5.6/Dockerfile

php/5.6/README.md

php/5.6/create_vhost

php/5.6/php.ini

php/5.6/start

php/7.1/Dockerfile

php/7.1/README.md

php/7.1/create_vhost

php/7.1/php.ini

php/7.1/start

php/test/README.md

php/test/docker-compose.test.5.6.yml

php/test/docker-compose.test.7.1.yml

php/test/src/sample.php

php/test/web/index.html

php/test/web/index.php

php/test/web/info.php