Progress, but String is not extended for some reason

package.json

@@ -21,6 +21,7 @@
   "dependencies": {
     "ember-cli-babel": "^6.6.0",
     "ember-cli-dunlop": "^0.0.0",
+    "ember-cli-emblem": "^0.10.0",
     "ember-semantic-ui-calendar": "^2.0.0"
   },
   "devDependencies": {
@@ -30,13 +31,13 @@
     "ember-cli": "~2.16.2",
     "ember-cli-coffeescript": "^1.16.1",
     "ember-cli-dependency-checker": "^2.0.0",
-    "ember-cli-emblem": "^0.10.0",
     "ember-cli-eslint": "^4.0.0",
     "ember-cli-htmlbars": "^2.0.1",
     "ember-cli-htmlbars-inline-precompile": "^1.0.0",
     "ember-cli-inject-live-reload": "^1.4.1",
     "ember-cli-moment-shim": "^3.7.1",
     "ember-cli-qunit": "^4.0.0",
+    "ember-cli-sass": "^8.0.1",
     "ember-cli-shims": "^1.1.0",
     "ember-cli-sri": "^2.1.0",
     "ember-cli-uglify": "^2.0.0",
@@ -49,6 +50,7 @@
     "ember-simple-auth": "^1.7.0",
     "ember-source": "~2.16.0",
     "loader.js": "^4.2.3",
+    "sass": "^1.15.2",
     "semantic-ui-ember": "^3.0.3"
   },
   "engines": {