Rpyc

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- Fixed mutable object used as kwarg for Server ctor `376`_
- Corrections to teleport example `374`_
- Lowered GIL-lock acquires for <64kb within channel sends to address slowness `280`_

.. _376: https://github.com/tomerfiliba/rpyc/pull/376
.. _374: https://github.com/tomerfiliba/rpyc/pull/374
.. _280: https://github.com/tomerfiliba/rpyc/issues/280

- fix default hostname for ipv6 in rpyc_classic.py (277)
- fix ThreadPoolServer not working (283)

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