Correct .gitlab-ci.yml mistakes

 + Understood jobs syntax (hopefully).
 + Using the CI linter now.
 + Found http://doc.gitlab.com/ce/ci/yaml/README.html.

.gitlab-ci.yml

@@ -4,7 +4,4 @@ before_script:
 
 # OCaml version 4.02
 ocaml402:
-  - opam init --comp 4.02.3
-  - ./configure --enable-tests
-  - make test
-  - opam pin add oclaunch .
+  script: "opam init --comp 4.02.3;./configure --enable-tests;make test;opam pin add oclaunch ."