Add phantomjs

Author: asakusuma

package.json

@@ -55,6 +55,7 @@
     "broccoli-string-replace": "^0.1.1",
     "broccoli-typescript-compiler": "^4.1.0",
     "broccoli-uglify-sourcemap": "^1.4.2",
+    "bundled-phantomjs-prebuilt": "^2.1.8-0",
     "chai": "^3.5.0",
     "chokidar": "^1.6.0",
     "express": "^4.13.4",