improve test enviroment and integrate with codeclimate reporter

.travis.yml

@@ -1,8 +1,20 @@
 language: node_js
 node_js:
+  - "10.15"
+  - "10.0"
+  - "8.15.0"
+  - "8.0.0"
+  - "7.0"
+  - "6.16.0"
+  - "6.0"
+  - "5.0"
+  - "4.9.1"
   - "4.0"
   - "4.1"
   - "iojs"
+env:
+  global:
+    - CC_TEST_REPORTER_ID=18b4941291c81f7002e4ec5d7d38c9b3e31cf89f2393165e6bcf647c4a15b062
 services:
   - mongo mydb_test --eval 'db.addUser("travis", "test");'
   - sleep 15
@@ -13,3 +25,11 @@ addons:
     - mongodb-3.0-precise
     packages:
     - mongodb-org-server
+before_script:
+  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+  - chmod +x ./cc-test-reporter
+  - ./cc-test-reporter before-build
+script:
+  - npm test
+after_script:
+  - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT