add continuous integration with gitlab

.gitlab-ci.yml

+image: moodlehq/moodle-php-apache:7.0
+
+services:
+ - mysql:latest
+
+cache:
+ paths:
+ - $HOME/.composer/cache
+
+variables:
+ MOODLE_BRANCH: "MOODLE_34_STABLE"
+ DB: "mysqli"
+ MYSQL_ROOT_PASSWORD: "superrootpass"
+ TRAVIS_BUILD_DIR: "$CI_PROJECT_DIR"
+
+before_script:
+ - apt update && apt install git-core mysql-client npm -y
+ - cd $CI_PROJECT_DIR/..
+ - curl -sS https://getcomposer.org/installer | php
+ - mv composer.phar /usr/local/bin/composer
+ - composer create-project -n --no-dev moodlerooms/moodle-plugin-ci ci ^1
+ - export PATH="$(cd ci/bin; pwd):$(cd ci/vendor/bin; pwd):$PATH"
+ - chmod u+x ci/bin/moodle-plugin-ci
+ - chmod u+x ci/bin/*
+ - umask u+x
+ - moodle-plugin-ci install --db-user=root --db-pass=superrootpass --db-host=mysql -vvv
+
+job1:
+ script:
+ - moodle-plugin-ci phplint ; moodle-plugin-ci phpcpd ; moodle-plugin-ci phpmd ; moodle-plugin-ci codechecker ; moodle-plugin-ci csslint ; moodle-plugin-ci shifter ; moodle-plugin-ci jshint ; moodle-plugin-ci validate ; moodle-plugin-ci phpunit ; moodle-plugin-ci behat