Add GitLab CI configuration file

.gitlab-ci.yml

+image: node:6.2
+
+cache:
+    paths:
+        - node_modules/
+
+before_script:
+    - npm install --silent
+    - node_modules/.bin/typings install
+
+run_tests:
+    script:
+        - npm run lint
+        - npm test
+    tags:
+        - node