Removing remnants of decent_exposure experiment
Big refactor and 'thinning'

Moved status changes on User and School models into their own methods.  Reworked Users and Schools controllers to use the newly minted model status change methods (e.g. 'PUT approve') instead of the update method hack that happened before.  Moved the model queries in the controllers into private finder methods and then exposed those as helpers.  Reworked the views to use the new model exposure helper methods instead if the instance variables.  Removed new, create, edit, and update methods from Schools.