Update .travis.yml

Author: thabti

.travis.yml

@@ -16,7 +16,7 @@ before_script:
   - sleep 3 # give xvfb some time to start
   - "export DISPLAY=:99.0"
   - "wget http://selenium.googlecode.com/files/selenium-server-standalone-2.31.0.jar"
-  - "java -jar selenium-server-standalone-2.31.0.jar &"
+  - "java -jar selenium-server-standalone-2.31.0.jar > /dev/null &"
   - sleep 5
 
 script: "npm run test:ci:$TEST_SUITE"