Merge branch 'dz-add-codequality' into 'master'

Add code quality job to gitlab-ci.yml

See merge request !138

.codeclimate.yml

+---
+engines:
+  bundler-audit:
+    enabled: true
+  duplication:
+    enabled: true
+    config:
+      languages:
+      - ruby
+  fixme:
+    enabled: true
+  rubocop:
+    enabled: true
+exclude_paths:
+- spec/
+- lib/vendor/
+- go/vendor/
+- tmp/
+- coverage/

.gitlab-ci.yml

@@ -70,3 +70,16 @@ go:1.6:
 go:1.5:
   <<: *go_definition
   image: golang:1.5
+
+codeclimate:
+  before_script: []
+  image: docker:latest
+  variables:
+    DOCKER_DRIVER: overlay
+  services:
+    - docker:dind
+  script:
+    - docker pull codeclimate/codeclimate
+    - docker run --env CODECLIMATE_CODE="$PWD" --volume "$PWD":/code --volume /var/run/docker.sock:/var/run/docker.sock --volume /tmp/cc:/tmp/cc codeclimate/codeclimate analyze -f json > codeclimate.json
+  artifacts:
+    paths: [codeclimate.json]