TASK: Only validate platform reqs while unit testing & remove test for 5.3 & 5.4

.gitlab-ci.yml

@@ -12,7 +12,7 @@ stages:
     - php -v
     - composer --no-ansi self-update
     - composer --no-ansi --version
-    - composer install --optimize-autoloader --classmap-authoritative --no-interaction --prefer-dist --no-ansi
+    - composer install --optimize-autoloader --classmap-authoritative --no-interaction --prefer-dist --no-ansi --ignore-platform-reqs
   artifacts:
     when: on_failure
     paths:
@@ -37,15 +37,10 @@ lint:coding-guideline:
     WITH_XDEBUG: "true"
   before_script:
     - apt-get update; apt-get install -y unzip
+    - docker-php-ext-enable redis
     - composer install --optimize-autoloader --no-interaction --no-ansi --prefer-dist
   script:
     - ./vendor/bin/phpunit --coverage-text --colors=never
-test:5.3:
-  <<: *test
-  image: tetraweb/php:5.3
-test:5.4:
-  <<: *test
-  image: tetraweb/php:5.4
 test:5.5:
   <<: *test
   image: tetraweb/php:5.5