Katsdptelstate

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* The default encoding is now msgpack; warn on loading pickles (75, 79)
* The default backend is now in-memory (76)
* Add the ability to dump in-memory backend to an RDB file (77)
* Construct from RDB file-like objects and Redis URLs (80, 82)
* Report keys and prefixes to the user as strings (73)
* Add IPython tab completion (83)
* RDB reader and writer cleanup (85, 86)

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* Introduce encodings and add msgpack encoding as alternative to pickle (64, 65)
* Introduce backends and add in-memory backend as alternative to redis (71, 72)
* Simplify setting attributes via `__setitem__` (68)
* Let keys be bytes internally, but allow specification as unicode strings (63)
* The GitHub repository is now public as well

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* Initial release of katsdptelstate