try to install latest nodejs version

.travis.yml

@@ -28,7 +28,6 @@ before_install:
     # get a newer node.js version
     - "export DISPLAY=:99.0"
     - "sh -e /etc/init.d/xvfb start"
-    - sudo add-apt-repository -y ppa:chris-lea/node.js  # ubuntu 12.04 only
     - sudo apt-get update
     - sudo apt-get install -o DPkg::Options::="--force-confold" -y libxml2 libxml2-dev libxml2-utils
     - npm install -g npm@latest
@@ -61,7 +60,8 @@ before_script:
     - cd apps/news/js
     # install test deps
     - npm install --deps # npm install needs to run before sudo npm install because otherwise it fails because a tmp file exists in the home dir
-    - sudo npm -g install gulp-cli protractor
+    - sudo npm -g install gulp-cli protractor n
+    - n latest
     - cd ..
     - wget https://scrutinizer-ci.com/ocular.phar