Merge branch 'productionEnvironment' into 'master'

Update README.md to specify production Jekyll configuration

See merge request !11

.gitlab-ci.yml

 image: ruby:2.3
 
+variables:
+  JEKYLL_ENV: production
+
+before_script:
+  - bundle install
+
 test:
   stage: test
   script:
-  - bundle
   - bundle exec jekyll build -d test
   artifacts:
     paths:
@@ -14,7 +19,6 @@ test:
 pages:
   stage: deploy
   script:
-  - bundle
   - bundle exec jekyll build -d public
   artifacts:
     paths:

README.md

@@ -56,6 +56,9 @@ defined in [`.gitlab-ci.yml`](.gitlab-ci.yml):
 ```
 image: ruby:2.3
 
+variables:
+  JEKYLL_ENV: production
+
 pages:
   script:
   - gem install jekyll