added person class to application
added bug report and allergen_warning to application
added meal component and relationship table for component - allergen
added meal and relationship table for meal_component
added feedback_for_meal table
added attendances and indication for meals table
database migrated
removed new and edit methods on allergen warning controller
redid last commit and added a small amount of validation
allergen_warning table has some validation. no session control yet
index staff and index student created