Add Gitlab Ci

README.md

 * [Sismo](http://sismo.sensiolabs.org/) - A continuous testing server library.
 * [Jenkins](http://jenkins-ci.org/) - A continous integration platform with [PHP support](http://jenkins-php.org/index.html).
 * [JoliCi](https://github.com/jolicode/JoliCi) - A continuous integration client written in PHP and powered by Docker.
+* [GitlabCi](https://about.gitlab.com/gitlab-ci/) - Let GitLab CI test, build, deploy your code. TravisCi like.
 
 ## Documentation
 *Libraries for generating project documentation.*