chore(travis): Use xvfb‑run

.travis.yml

@@ -4,20 +4,20 @@ node_js:
   - 6
 
 services:
-  - xvbf
+  - xvfb
 
 before_install:
   - export CHROME_BIN=chromium-browser
   - export DISPLAY=:99.0
+  - sh -e /etc/init.d/xvfb start
 
 before_script:
-  # gulpfile uses the Gulp v3 API
-  - npm install -g [email protected]
+  - npm install -g gulp-cli
 
 script:
   - npm install
-  - gulp build
-  - gulp test
+  - npm run build
+  - xvfb-run npm run test
 
 deploy:
   - provider: s3

package.json

@@ -4,7 +4,8 @@
   "description": "Gfycat js embed",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "build": "gulp build",
+    "test": "gulp test"
   },
   "repository": {
     "type": "git",