message: fix modelType function signature
diff: import Ember from 'ember';
  -export function modelType([model]) {
  +export function modelType(model) {
  if (model) {
  - return model.get('type') || model.constructor.modelName;
  + return Ember.get(model, 'type') || model.constructor.modelName;
  }
  }
  -export default Ember.Helper.helper(modelType);
  +export default Ember.Helper.helper(function([model]){
  + return modelType(model);
  +});
  