Ncplib

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- Fixed bug with Node authentication due to premature sending of LINK packets.
- Fixed edge-case bug in connection closing.

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- Added Python 3.4 support.
- Added :meth:`Connection.is_closing`.
- Added :attr:`Connection.remote_hostname`.
- Added ``auto_link`` parameter to :func:`connect`, :func:`start_server` and ``run_app``.
- Added ``remote_hostname`` parameter to :func:`connect`.
- Connection open and close log messages demoted from ``INFO`` to ``DEBUG`` level.

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- Client hostname used in :func:`connect` defaults to system hostname, instead of ``"python3-ncplib"``.
- Added ``hostname`` parameter to :func:`connect`, to override default client hostname.
- Removed multiplexing support for multiple :class:`Response` over a single connection. This must now be implemented in
application code.
- :class:`Connection` logger no longer formats the host and port in log messages. This must now be done using the
standard Python :class:`logging.Formatter`.

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- Added support for parsing known embedded footer bug from Axis nodes.
- Fixed pending deprecation warning for legacy ``__aiter__`` protocol.

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- Using ``transport.is_closing()`` to detect lost connection, making ncplib compatible with ``uvloop``.

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- :meth:`Connection.recv_field` and :meth:`Response.recv_field` now raise an exception on network error to match the behavior of :meth:`Connection.recv` and :meth:`Response.recv`. Previously they returned ``None`` on network error, an undocumented and undesired behavior.