travis.yml to work with ubuntu precise worker

.travis.yml

@@ -3,17 +3,18 @@ python:
   - "2.7"
 
 install:
-  # requirements
-  #
-
-  # todo add -qq to quietly install dependencies
-  - sudo apt-get install -qqy nodejs npm optipng jpegoptim libjpeg-progs asciidoc libxml2-dev libxslt1-dev libpcre3-dev
-  - sudo apt-get install libtiff4-dev libjpeg8-dev zlib1g-dev libfreetype6-dev liblcms2-dev libwebp-dev tcl8.5-dev tk8.5-dev python-tk
+  - sudo apt-get purge -y nodejs
+  - sudo apt-get install -qqy python-software-properties
+  - sudo add-apt-repository -y ppa:chris-lea/node.js
+  - sudo apt-get -qq update
+  - sudo apt-get install -qqy nodejs optipng jpegoptim libjpeg-progs asciidoc libxml2-dev libxslt1-dev libpcre3-dev
+  - sudo apt-get install -qqy libtiff4-dev libjpeg8-dev zlib1g-dev libfreetype6-dev liblcms2-dev libwebp-dev tcl8.5-dev tk8.5-dev python-tk
   # Ubuntu 14
   # - sudo apt-get install -y libtiff5-dev libjpeg8-dev zlib1g-dev libfreetype6-dev liblcms2-dev libwebp-dev tcl8.6-dev tk8.6-dev python-tk
-  - sudo npm install -g sass@0.5.0 requirejs@2.1 stylus@0.51 uglify-js@2.4 less@2.5.1
-  # uglify requires node instead of nodejs binary
-  - sudo ln -s /usr/bin/nodejs /usr/bin/node
+
+  # JS dependencies
+  - sudo npm install -g sass@0.5.0 requirejs@2.1 stylus@0.51 uglify-js@2.4.23 less@2.5.1
+
   # Python test requirements
   - pip install -r dev-req.txt