fix travis

Author: TimNN

.travis.yml

@@ -10,8 +10,8 @@ before_install:
   - sudo apt-get -o Dpkg::Options::="--force-confnew" install -y docker-engine
 
 install:
-  # needed for linting JS below
-  - npm install jshint
+  # needed for linting JS below (npm does not seem to be in sudo's path)
+  - sudo `which npm` install -g jshint
   # this is a dependency of playpen currently
   - sudo pip install pygments