No need to install nodejs on Travis

.travis.yml

@@ -13,7 +13,7 b' before_install:'
     # Pierre Carrier's PPA for PhantomJS and CasperJS
     - time sudo add-apt-repository -y ppa:pcarrier/ppa
     - time sudo apt-get update
-    - time sudo apt-get install pandoc casperjs nodejs libzmq3-dev
+    - time sudo apt-get install pandoc casperjs libzmq3-dev
     # pin tornado < 4 for js tests while phantom is on super old webkit
     - if [[ $GROUP == 'js' ]]; then pip install 'tornado<4'; fi
     - time pip install -f https://nipy.bic.berkeley.edu/wheelhouse/travis jinja2 sphinx pygments tornado requests mock pyzmq jsonschema jsonpointer mistune