Adding user agent logging for api logins.
Blocking dumb client apps without user agents.
Normalizing user agents for better detectibility.
Scheduling stale feeds for flat feed users, too.
Merge branch 'master' into offline

* master:
  Scheduling stale feeds for flat feed users, too.
  Normalizing user agents for better detectibility.
  Blocking dumb client apps without user agents.
  Adding user agent logging for api logins.