added two migrations to add fields "expired" and "expiration_date"

added :expired and :expiration_date to event_update_params

added radio buttons to _event.html.haml

added datepicker to _event.html.haml

edited home.html.haml to check if event expired before rendering submit proposal link

edited control_controller index action to only grab events with expired = 'f'

need to add a way to check if the expiration date is past, then updated the db boolean