chore(package): update ember-ajax to version 2.3.1
chore(package): update ember-ajax to version 2.3.1

https://greenkeeper.io/
mike-north/ember-creditcard,mike-north/ember-creditcard,levanto-financial/ember-creditcard,levanto-financial/ember-creditcard,mike-north/ember-creditcard,levanto-financial/ember-creditcard