Lint our code before anything else (will break the build for now!)

.travis.yml

@@ -11,6 +11,7 @@ addons:
       - g++-4.8
 
 script:
+  - ./node_modules/.bin/eslint src/
   - npm run-script build
   # Automatically deploy website onto gh-pages (if master and not PR)
   # Don't do this in `after_success`, because then failures won't bubble up