chore(package): update ember-ajax to version 3.1.4

Closes #58

Author: greenkeeper[bot]

package.json

@@ -75,7 +75,7 @@
     "cssnano": "^3.9.1",
     "cssstats": "^3.0.0",
     "del-cli": "^0.2.1",
-    "ember-ajax": "^2.4.1",
+    "ember-ajax": "^3.1.4",
     "ember-cli": "2.10.0",
     "ember-cli-app-version": "^2.0.0",
     "ember-cli-babel": "^5.1.7",