language: node_js
node_js: "0.12"
services:
- mongodb
before_install:
- gem install fluentd --no-ri --no-rdoc

language: node_js
node_js:
- "0.12"
- "4"
services:
- mongodb
before_install:
- gem install fluentd --no-ri --no-rdoc

Add Node.js 4.0 to Travis CI target
Add Node.js 4.0 to Travis CI target

There is high prossibility that we'll move on to the next version. It
may be better to test for both 0.12 and 4.
