Add Pundit Exception rescue to ApplicationController
Add Pundit Exception rescue to ApplicationController

Updates the application controller to rescue pundit expections and
redirects the user to the login page. We'll refactor this soon to make
the redirects more relevant to where they originated.

CollegeSTAR/collegestar_org,CollegeSTAR/collegestar_org,CollegeSTAR/collegestar_org