upgrade to Ember/Ember CLI to 2.15

Author: David Tang

package.json

@@ -32,11 +32,11 @@
     "ember-ajax": "^3.0.0",
     "ember-changeset": "^1.3.0",
     "ember-changeset-validations": "^1.2.8",
-    "ember-cli": "~2.14.1",
-    "ember-cli-dependency-checker": "^1.3.0",
+    "ember-cli": "~2.15.1",
+    "ember-cli-dependency-checker": "^2.0.0",
     "ember-cli-eslint": "^3.0.0",
     "ember-cli-htmlbars": "^2.0.1",
-    "ember-cli-htmlbars-inline-precompile": "^0.4.3",
+    "ember-cli-htmlbars-inline-precompile": "^1.0.0",
     "ember-cli-inject-live-reload": "^1.4.1",
     "ember-cli-qunit": "^4.0.0",
     "ember-cli-shims": "^1.1.0",
@@ -47,7 +47,7 @@
     "ember-load-initializers": "^1.0.0",
     "ember-resolver": "^4.0.0",
     "ember-sinon": "^0.7.0",
-    "ember-source": "~2.14.1",
+    "ember-source": "~2.15.0",
     "loader.js": "^4.2.3"
   },
   "engines": {

testem.js

@@ -3,10 +3,17 @@ 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'
+    ]            
+  }
 };