Remove some functions from exported model API that are not used outside model layer
Remove some functions from exported model API that are not used outside model layer

- Just some refactoring to trim down the number of things exported that aren't
  necessary at this time.

paulocheque/guides-cms,paulocheque/guides-cms,pluralsight/guides-cms,paulocheque/guides-cms,pluralsight/guides-cms,pluralsight/guides-cms