feed: add Entry and take first stab at the river
Feed.hubs: use list comprehension
use single quotes
feed/views.py: sort by -published along with Feed.name
Feed: use a custom FeedManager
view_river: display all entries from past 24 hours
parsed_to_datetime: published can't be in the future

Use current UTC if published is in the future.
view_river.html: add some style
feed/views.py: sort by Feed.id, not Feed.name
Feed: handle feed errors more gracefully
add update_all management command
view_river.html: shrink padding-left on <ul>
update_all.py: display total number of updates
view_river.html: hide publisher if it's a dupe
view_river.html: display number of entries at bottom
Feed.update: don't truncate title
feed/views.py: update feeds on POST callbacks
view_river.html: hide &raquo; when the feed doesn't change
feed/tests.py: test feed request failure
feed/tests.py: add test for parsed_to_datetime