Selectors34

----------------------------

* Pull request 3: ``wrap_error()`` compatibility layer for PEP 3151 has been
removed.
(Patch written by Victor Stinner.)
* Pull request 4: Fix ``TypeError`` when ``select.select()`` is monkeypatched
by Gevent. Note that this is no longer an issue with the stdlib
``selectors`` module on Gevent 1.1 and later.
(Patch written by Przemysław Węgrzyn.)
* Pull request 7: Fix a memory leak when GC is disabled.
(Patch written by Max Baryshnikov.)

----------------------------

* Issues 23209, 23225: ``selectors.BaseSelector.get_key()`` now raises a
``RuntimeError`` if the selector is closed. And
``selectors.BaseSelector.close()`` now clears its internal reference to the
selector mapping to break a reference cycle.
(Initial patch written by Martin Richard and backported by Victor Stinner.)
* Issues 23209, 23225: ``selectors.BaseSelector.close()`` now clears its
internal reference to the selector mapping to break a reference cycle.
(Initial patch written by Martin Richard and backported by Victor Stinner.)
* Issue 23009: Make sure ``selectors.EpollSelector.select()`` works when no
FD is registered.
(Backported by Victor Stinner.)

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* Initial release.