Added GitLab CI Build

Based off work done on SRCT/srctweb and https://gist.github.com/kud/c43c76dff0499f9867afe9a073082484

.gitlab-ci.yml

+image: node:6.5.0
+
+build:
+  stage: build
+  script:
+  - npm install
+  - npm run build
+  artifacts:
+    paths:
+    - build
+