Parallel-ssh

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Fixes
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* Native parallel client ``forward_ssh_agent`` flag would not be applied correctly.

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Fixes
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* Native client socket timeout setting would be longer than expected - 133

Packaging
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* Added Windows 3.7 wheels

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Changes
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* Native client no longer requires public key file for authentication.
* Native clients raise ``pssh.exceptions.PKeyFileError`` on object initialisation if provided private key file paths cannot be found.
* Native clients expand user directory (``~/<path>``) on provided private key paths.
* Parallel clients raise ``TypeError`` when provided ``hosts`` is a string instead of list or other iterable.

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Changes
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* Better tunneling implementation for native clients that supports multiple tunnels over single SSH connection for connecting multiple hosts through single proxy.
* Added ``greenlet_timeout`` setting to native client ``run_command`` to pass on to getting greenlet result to allow for greenlets to timeout.
* Native client raises specific exceptions on non-authentication errors connecting to host instead of generic ``SessionError``.


Fixes
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* Native client tunneling would not work correctly - 123.
* ``timeout`` setting was not applied to native client sockets.
* Native client would have ``SessionError`` instead of ``Timeout`` exceptions on timeout errors connecting to hosts.

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Changes
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* Re-generated C code with latest Cython release.

Fixes
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* ``ssh2-python`` >= 0.14.0 support.

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Fixes
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* Native client proxy initialisation failures were not caught by ``stop_on_errors=False`` - 121.