AJ-1617 Built initial rake task to generate course analytics exports.
AJ-1617 Updated analytics export rake tasks with correct collection names.
Fixed issue with Sidekiq ignoring REDIS_URL when connecting.
AJ-1437 Turning on exceptions in development for mass-assignment errors.
Removed redundancy in assignments controller actions using custom render.
AJ-1437 Fixed mass-assignment vulnerabilities with assignment_type nested attributes in assignment form/controller.
WIP: Began fixing redundancy in grades_controller actions. Still need to update routes and test.