Maybe fix the gitlab build

- maybe not
- who wants to bet it fails

.gitlab-ci.yml

-image: node:4.2.6
+image: node:7.6.0
 
 build_css:
     before_script:
-        - npm install -g grunt-cli
         - npm install
+        - bower install
+        - gem install sass
     script:
-        - grunt swatch:masonstrap
+        - grunt swatch
     artifacts:
         paths:
-            - masonstrap/masonstrap.min.css
+            - masonstrap/bootstrap.min.css