Add assertion for dasherized keys in resource
Add assertion for dasherized keys in resource

-  is the JSON API recommendation
-  and  are preferred

Failed assertion handled by console.warn

proteamer/ember-jsonapi-resources,greyhwndz/ember-jsonapi-resources,rwjblue/ember-jsonapi-resources,Rahien/ember-jsonapi-resources,kmkamruzzaman/ember-jsonapi-resources,pixelhandler/ember-jsonapi-resources,greyhwndz/ember-jsonapi-resources,kmkamruzzaman/ember-jsonapi-resources,oliverbarnes/ember-jsonapi-resources,rwjblue/ember-jsonapi-resources,oliverbarnes/ember-jsonapi-resources,pixelhandler/ember-jsonapi-resources,proteamer/ember-jsonapi-resources,Rahien/ember-jsonapi-resources