language: node_js
node_js: 
  - "5.12.0"
  - "4.2.6"
  - "4.5.0"
services:
  - mongodb
install:
  - travis_retry npm install mocha
  - travis_retry npm install chai
  - travis_retry npm install mongoose
language: node_js
node_js: 
  - "5"
  - "4"
services:
  - mongodb
install:
  - travis_retry npm install
  - travis_retry npm install mocha
  - travis_retry npm install chai
  - travis_retry npm install mongoose
Test only for 5 and 4
Test only for 5 and 4
