added _update_models method to Website
now making database changes in Website.execute()
fixes: passing contest, not url, better redirection
stripped some whitespace
added website model
added action_submit_website task
added submit-website page
added page to view submitted websites
now redirecting to submitted-websites after website submission
added pp-link-slider function
added action_submitted_websites
properly commented action_submit_website
added get_submitted_websites to Contest
get_url -> get_urls in Website model