Enabled CI

.gitlab-ci.yml

+stages:
+  - test
+
 docs:
   stage: test
   image: davidhrbac/docker-mdcheck:latest
@@ -7,11 +10,12 @@ docs:
 
 pylint:
   stage: test
+  image: centos/python-27-centos7
   script:
   - pylint --max-module-lines=3000 *.py
 
 shellcheck:
   stage: test
-  image: koalaman/shellcheck:latest
+  image: davidhrbac/docker-shellcheck:latest
   script:
   - shellcheck *.sh