chore(package): update ember-cli to version 2.9.0 (#354)

https://greenkeeper.io/

.gitignore

@@ -11,7 +11,7 @@ pids
 logs
 results
 
-npm-debug.log
+npm-debug.log*
 .nvmrc
 .bowerrc
 .idea/*

package.json

@@ -21,7 +21,7 @@
     "test": "ember test"
   },
   "engines": {
-    "node": "~0.10.0 || ~0.12.0 || ^4.2.0"
+    "node": "~0.12.0 || ^4.2.0"
   },
   "devDependencies": {
     "bluebird": "3.4.6",
@@ -36,7 +36,7 @@
     "codemirror": "5.18.2",
     "csscomb": "3.1.8",
     "ember-ajax": "ember-cli/ember-ajax#b32b9ee5ede69e09a162eb98d354f7de6297f679",
-    "ember-cli": "2.8.0",
+    "ember-cli": "2.9.0",
     "ember-cli-app-version": "2.0.0",
     "ember-cli-babel": "5.1.10",
     "ember-cli-content-security-policy": "0.5.0",

tests/index.html

@@ -47,7 +47,7 @@
     {{content-for "body"}}
     {{content-for "test-body"}}
 
-    <script src="{{rootURL}}testem.js" integrity=""></script>
+    <script src="/testem.js" integrity=""></script>
     <script src="{{rootURL}}assets/vendor.js"></script>
     <script src="{{rootURL}}assets/test-support.js"></script>
     <script src="{{rootURL}}assets/ghost.js"></script>