Test Travis CI on OS X and Linux for multiple node versions on Docker.

.travis.yml

@@ -1,19 +1,27 @@
-language: node_js
-node_js:
-  - 0.12
-  - 4
-  - 5
-
-before_install:
-# We need this line to have g++4.8 available in apt
-  - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq gcc-4.8 g++-4.8
-# We want to compile with g++ 4.8 when rather than the default g++
-  - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 90
-
-before_script:
-  - npm install --dev
-
+os:
+  - linux
+  - osx
+sudo: false
+language: cpp
+addons:
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test
+    packages:
+      - g++-4.8
+env:
+  matrix:
+    - TRAVIS_NODE_VERSION="0.12"
+    - TRAVIS_NODE_VERSION="4"
+    - TRAVIS_NODE_VERSION="5"
+cache:
+  directories:
+    - node_modules
+install:
+  - rm -rf ~/.nvm && git clone https://github.com/creationix/nvm.git ~/.nvm && (cd ~/.nvm && git checkout `git describe --abbrev=0 --tags`) && source ~/.nvm/nvm.sh && nvm install $TRAVIS_NODE_VERSION
+  - node --version
+  - if [[ $TRAVIS_OS_NAME == "linux" ]]; then export CXX=g++-4.8; fi
+  - $CXX --version
+  - npm install
 script:
   - npm test