• Python 2: sendall on a non-blocking socket could spuriously fail
  with a timeout.
• If sys.stderr has been monkey-patched (not recommended),
  exceptions that the hub reports aren't lost and can still be caught.
  Reported in :issue:825 by Jelle Smet.
• :class:selectors.SelectSelector is properly monkey-patched
  regardless of the order of imports. Reported in :issue:835 by
  Przemysław Węgrzyn.
• Python 2: reload(site) no longer fails with a TypeError if
  gevent has been imported. Reported in :issue:805 by Jake Hilton.