Fixed some bugs:
   Subscriptions was showing even if not logged in
   Made it so that hitting enter in the auto-completes on the feed page triggers the add button
   Fixed bug where the enable_email / email_frequency wasn't updating properly

 Refactored db_update_articles into a manage.py command and added a /update view which calls the updater, so that it can be updated by just making a cron job that hits that url with wget every night.