• PyPy: Fix a memory leak for code that allocated and disposed of many
  :class:gevent.lock.Semaphore subclasses. If monkey-patched, this could
  also apply to :class:threading.Semaphore objects. Reported in
  :issue:660 by Jay Oster.
• PyPy: Cython version 0.23.4 or later must be used to avoid a memory
  leak (details_). Thanks to Jay Oster.
• Allow subclasses of :class:~.WSGIHandler to handle invalid HTTP client
  requests. Reported by not-bob.
• :class:~.WSGIServer more robustly supports :class:~logging.Logger-like parameters for
  log and error_log (as introduced in 1.1b1, this could cause
  integration issues with gunicorn). Reported in :issue:663 by Jay
  Oster.
• :class:~gevent.threading._DummyThread objects, created in a
  monkey-patched system when :func:threading.current_thread is
  called in a new greenlet (which often happens implicitly, such as
  when logging) are much lighter weight. For example, they no longer
  allocate and then delete a :class:~gevent.lock.Semaphore, which is
  especially important for PyPy.
• Request logging by :mod:gevent.pywsgi formats the status code
  correctly on Python 3. Reported in :issue:664 by Kevin Chen.
• Restore the ability to take a weak reference to instances of exactly
  :class:gevent.lock.Semaphore, which was unintentionally removed
  as part of making Semaphore atomic on PyPy on 1.1b1. Reported in
  :issue:666 by Ivan-Zhu.
• Build Windows wheels for Python 3.5. Reported in :pr:665 by Hexchain Tong.