Ember data serializer changes to work with katharsis, thanks to @dfalling

katharsis-custom-serializer.js

import DS from 'ember-data';

export default DS.JSONAPISerializer.extend({

  // This returns the key as-is to the model, instead of converting between a dasherized JSONAPI and a camelCased JS model.
  keyForAttribute(key) {
    return key;
  },
  keyForRelationship(key) {
    return key;
  }

  // When it comes time to save new data to a JSONAPI, 
  // this issue might also be relevant: https://github.com/emberjs/data/issues/3645
});