Merge pull request #1221 from minrk/retry-js-tests

retry js tests on travis

.travis.yml

@@ -33,7 +33,7 @@ install:
     - pip install -f travis-wheels/wheelhouse file://$PWD#egg=notebook[test]
 
 script:
-    - 'if [[ $GROUP == js* ]]; then python -m notebook.jstest ${GROUP:3}; fi'
+    - 'if [[ $GROUP == js* ]]; then travis_retry python -m notebook.jstest ${GROUP:3}; fi'
     - 'if [[ $GROUP == python ]]; then nosetests -v --with-coverage --cover-package=notebook notebook; fi'
 
 matrix: