Add io.js testing (/ht @mathiasbynens & @jdalton)

.travis.yml

@@ -6,3 +6,5 @@ before_install:
  - sudo apt-get update -qq
  - sudo apt-get install -qq libgif-dev libpng-dev libjpeg8-dev libpango1.0-dev libcairo2-dev
  - '[ "${TRAVIS_NODE_VERSION}" = "0.6" ] && npm conf set strict-ssl false || true'
+ - "IOJS_VERSION=v1.0.1; wget https://iojs.org/dist/${IOJS_VERSION}/iojs-${IOJS_VERSION}-linux-x64.tar.xz && tar xvfJ iojs-${IOJS_VERSION}-linux-x64.tar.xz && sudo mv iojs-${IOJS_VERSION}-linux-x64/bin/iojs /usr/local/bin"
+

package.json

@@ -30,7 +30,7 @@
   "license": "MIT",
   "scripts": {
     "build": "node build.js modules=ALL exclude=json,cufon,gestures",
-    "test": "node test.js && jshint src"
+    "test": "node test.js && iojs test.js && jshint src"
   },
   "dependencies": {
     "canvas": "1.1.x",