language: node_js
node_js:
  - "stable"
before_script:
  - npm install -g gulp
script: gulp


language: node_js
node_js:
  - "stable"
  - "4.3"
  - "4.2"
before_script:
  - npm install -g gulp
script: gulp


Add Node 4.2 and 4.3 to Travis CI config.
Add Node 4.2 and 4.3 to Travis CI config.

"stable" builds on Node 5.6, while I'm targeting Node.js LTS, which is
currently version 4.3.1.  As I'm still locally on Node.js 4.2.6, build
on that too for now.
