add `npm install`

.travis.yml

@@ -9,9 +9,10 @@ branches:
   - master
   - remix_live
 script:
+  - npm install
   - npm run lint && npm run test && npm run make-mock-compiler && npm run build
   - wget http://selenium-release.storage.googleapis.com/3.5/selenium-server-standalone-3.5.3.jar
-  - java -jar selenium-server-standalone-3.5.3.jar
+  - java -jar selenium-server-standalone-3.5.3.jar &
   - ./ci/browser_tests.sh
 deploy:
   - provider: script