extract enclosures from rss feed
display enclosure urls, for testing
create migrations for feeds and files
add media_type to files table
use activerecord feed and strong params
connect sessionsHelper to feeds_controller
changed 'files' to 'enclosures'
change 'files' to 'enclosures' (missed some stuff)
feeds_controller now saves feeds and enclosures to db
use feeds#show for list of urls