Pyownet

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

- legacy ``OwnetProxy`` class deleted
- official support for Python 3.6 in ``tox.ini`` and ``setup.py``
- Python2 uses ``str`` instead of ``unicode`` for pathnames.
(E.g. the return of ``proxy().dir()``)
- Support for Python 3.2 dropped (no more unit testing.)

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

Per call ``timeout`` API implemented.

- restructure ``proxy()`` factory to avoid circular ref. on saved exception
- modify ``_OwnetConnection`` to ensure that a persistent connection is
closed on errors (relevant for timeouts and other connection errors)
- implemented explicit timeout on ownet protocol methods;
raises ``OwnetTimeout``
- ``socket`` code reviewed and refactored
- wrap calls to socket methods in ``_OwnetConnection`` and raise
``ConnError`` in case of ``OSerror``'s (close 5)
- deprecated classes moved to ``pyownet.legacy`` module

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

No major new features, API cleanup to ensure that connections are
properly closed. Functions that return binary data return ``bytes``.

- implement dummy context management protocol for ``_Proxy``
for consitency with _PersistentProxy
- ``OwnetProxy`` class deprecated
- create a diagnostics directory ``./diags``
- move test suite from ``./test`` to ``./tests``
- ``pyownet.protocol._OwnetConnection.req()`` returns ``bytes`` and not
``bytearray``.
This is due to a simplification in
``pyownet.protocol._OwnetConnection._read_socket()`` method.
- better connection logic in ``pyownet.protocol.proxy()`` factory:
first connect or raise ``protocol.ConnError``,
then test owserver protocol or raise ``protocol.ProtocolError``
- use relative imports in ``pyownet.protocol``
- ``./test`` and ``./examples`` minor code refactor
- ``.gitignore`` cleanup (use only project specific ignores)
- add ``__del__`` in ``_PersistentProxy`` to ensure connection is closed
- use ``with _OwnetConnection`` inside ``_Proxy`` to shutdown sockets
- implement context management protocol for ``_OwnetConnection`` to
guarantee that connection is shutdown on exit
- py26 testing via ``unittest2``
- transform ``./test`` directory in package, so that common code
(used for reading configuration files) can be shared more easily
- move ``./pyownet`` to ``./src/pyownet``