Fixed test broken by new CSS changes and the removal of a few unessecarry show (e.g. org, guidance, etc.) pages

broken generic error message handler apart into separate create/update/destroy versions. updated calls within the controllers and fixed tests DMPRoadmap/roadmap#227

added checks to make sure records are actually created/updated/deleted

added hack to override the application controller's current_user since its nil in the controller and causing policy check to fail in Travis

added require statement for test_helper into all functional tests

added tests for guidance_group controller and added method to test helper to get org admin DMPRoadmap/roadmap#212

added initial tests for guidance_groups_controller