ref: Fix tooling-based issues, adds debugLogger and update TravisCI

* ref: Fix golint, gofmt, gocyclo, ineffassign and misspell issues
* ci: Add golint to TravisCI
* ref: Add simple debugLogger

Author: kamilogorek

.travis.yml

@@ -27,6 +27,16 @@ after_script:
   - zeus upload -t "application/x-xunit+xml" xunit.xml
 
 matrix:
+  include:
+    - name: "golint 1.9.x"
+      go: 1.9.x
+      script: ./scripts/lint.sh
+    - name: "golint 1.10.x"
+      go: 1.10.x
+      script: ./scripts/lint.sh
+    - name: "golint 1.11.x"
+      go: 1.11.x
+      script: ./scripts/lint.sh
   allow_failures:
     - go: tip