Todo:
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- Fix Subscription Timeout!!!!
  (Just try subscribing to blog.honecombio.com)

UI:
- Account creation flow
  - Maximum userid length enforced
  - Banner for success and the like?
- Recover lost password flow
- Add/remove river sets
- Import/export OPML
- CSR protection

Back-end Stuff:
- Measure things:
  - Number of concurrent HTTP connections
  - Latencies of various things
- Login cookie cache scrubber
- Max request size
- Limit on HTTP response sizes, strong timeouts
  - Remember that attackers dictate URLs.
- Throttle login requests
- Send email

Tests:
- Some known feed snapshots, check to make sure rivers match. (Make sure
  to mock the web and return fake images, &c.)

Shipping:
- Implement ATOM cache timeout and RSS skip hours and the like to poll more
  intelligently.

Later:
- Extract enclosures and the like, store locally (in the DB) and present them
  in the river. (Then do UI work to expose audio enclosures and the like.)
- Trim rivers that get too big
- God these names are all terrible -- river? feed? what's what?

Far future:
- For the future, we'll probably need options on individual feeds for
  processing to make them better. It is possible to over-engineer this so be
  careful.
- Implement pubsubhubbub?