Removed .json rendering
Moved logic for recurring blackouts to BlackOut model from controller
Simplified method calls and setting set_id in BlackOut model
Resolved #374 problem with error catching when creating recurring blackout
Moved date validation to BlackOut model
Refactored setting dates to private method
Merge pull request #387 from YaleSTC/380_BlackOutsController_refactoring

380 refactor BlackOutsController