Update travisCI

Author: aayusharyan

.travis.yml

@@ -1,5 +1,7 @@
 language: node_js
 sudo: false
+services:
+  - xvfb
 cache:
   directories:
     - node_modules

travis.sh

@@ -2,11 +2,10 @@
 
 set -e
 
-if [ $TEST = "unit-tests" ]; then
+if [[ $TEST = "unit-tests" ]]; then
 
   echo "Running unit-tests"
   export DISPLAY=:99.0
-  sh -e /etc/init.d/xvfb start
   sleep 1
   grunt karma:coverage
   CODECLIMATE_REPO_TOKEN=64800c476bad6ab9d10d0ff0901ae2c211457852f28c5f960ae5165c1fdfec73 codeclimate-test-reporter < coverage/*/lcov.info