Merge pull request #6703 from minrk/install-mathjax-travis

install local mathjax on Travis

.travis.yml

@@ -17,8 +17,9 b' before_install:'
     # 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!=2.4.2 mock pyzmq jsonschema jsonpointer mistune
+    - if [[ $GROUP == 'js' ]]; then python -m IPython.external.mathjax; fi
 install:
-    - time python setup.py install -q 
+    - time python setup.py install -q
 script:
     - cd /tmp && iptest $GROUP