Manhole

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* Changed ``manhole-cli``:

* Won't spam the terminal with errors if socket file doesn't exist.
* Allowed sending any signal (new ``--signal`` argument).
* Fixed some validation issues for the ``PID`` argument.

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* Added support for installing the manhole via the ``PYTHONMANHOLE`` environment variable.
* Added a ``strict`` install option. Set it to false to avoid getting the ``AlreadyInstalled`` exception.
* Added a ``manhole-cli`` script that emulates ``socat readline unix-connect:/tmp/manhole-1234``.

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* Added ``socket_path`` install option (contributed by `Nir Soffer`_).
* Added ``reinstall_delay`` install option.
* Added ``locals`` install option (contributed by `Nir Soffer`_).
* Added ``redirect_stderr`` install option (contributed by `Nir Soffer`_).
* Lots of internals cleanup (contributed by `Nir Soffer`_).

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* Fix OS X regression.

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* Support for OS X (contributed by `Saulius Menkevičius`_).

.. _Saulius Menkevičius: https://github.com/razzmatazz
.. _Nir Soffer: https://github.com/nirs