Pyramid-kvs

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* Switch default serializer to json

..warning::

pickle serialize datetime by default, json don't, force the
serializer to pickle for backward compatibility in case datetime
are serialized

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* Fix backward incompatibility of redis 3.x
* Drop support of redix 2.x branch

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* Switch default serializer to json

..warning::
pickle serialize datetime by default, json don't, force the
serializer to pickle for backward compatibility in case datetime
serialized

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* Don't freeze pyramid version
* Remove support of python 2.6

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* Add get keys for Redis

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* Bump version for PyPI upload problems

A file named "pyramid-kvs-0.2.1.tar.gz" already exists for pyramid-kvs-0.2.1.
To fix problems with that file you should create a new release.