Use headless Chrome for CI testing

Author: Turbo87

.travis.yml

@@ -7,9 +7,11 @@ cache:
   directories:
     - $HOME/.yarn-cache
 
+addons:
+  chrome: stable
+
 before_install:
   - nvm install 6.10.0
-  - export PATH=/usr/local/phantomjs-2.0.0/bin:$PATH
   - npm config set spin false
   - npm install -g yarn
 

docs/CONTRIBUTING.md

@@ -117,19 +117,10 @@ talk to:
 
 #### Running the frontend tests
 
-In order to run the frontend tests, you will need to have installed:
-
-- [phantomjs](http://phantomjs.org/) >= 2.1.1
-
-`npm install phantomjs-prebuilt` is an easy way to install phantomjs; see its
-website for other installation methods or use your preferred method of
-installing dependencies.
-
-Once phantomjs is installed, run the frontend tests with:
+You can run the frontend tests with:
 
 ```
-yarn run ember test
-yarn run ember test --server
+yarn test
 ```
 
 ### Working on the Backend

testem.js

@@ -6,10 +6,17 @@ module.exports = {
     'test_page': 'tests/index.html?hidepassed',
     'disable_watching': true,
     'launch_in_ci': [
-        'PhantomJS'
+        'Chrome'
     ],
     'launch_in_dev': [
-        'PhantomJS',
         'Chrome'
-    ]
+    ],
+    'browser_args': {
+        'Chrome': [
+            '--disable-gpu',
+            '--headless',
+            '--remote-debugging-port=9222',
+            '--window-size=1440,900'
+        ],
+    }
 };