Code styling changes

.gitlab-ci.yml

+before_script:
+  - gem install rubocop --no-ri --no-rdoc
+syntax:
+  script:
+    - find . -name '*\.rb' -exec bash -c 'echo -ne "{}\t\t\t" && ruby -c {}' \;
+  tags:
+    - ruby
+style:
+  script:
+    - rubocop -f s
+  tags:
+    - ruby
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