Pynacl

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* reorder link time library search path when using bundled
libsodium

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* Fixed a circular import bug in ``nacl.utils``.

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* Dropped support for Python 2.6.
* Added ``shared_key()`` method on ``Box``.
* You can now pass ``None`` to ``nonce`` when encrypting with ``Box`` or
``SecretBox`` and it will automatically generate a random nonce.
* Added support for ``siphash24``.
* Added support for ``blake2b``.
* Added support for ``scrypt``.
* Update ``libsodium`` to 1.0.11.
* Default to the bundled ``libsodium`` when compiling.
* All raised exceptions are defined mixing-in
``nacl.exceptions.CryptoError``

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* Fix an issue with absolute paths that prevented the creation of wheels.

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* PyNaCl has been ported to use the new APIs available in cffi 1.0+.
Due to this change we no longer support PyPy releases older than 2.6.
* Python 3.2 support has been dropped.
* Functions to convert between Ed25519 and Curve25519 keys have been added.

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* The low-level API (`nacl.c.*`) has been changed to match the
upstream NaCl C/C++ conventions (as well as those of other NaCl bindings).
The order of arguments and return values has changed significantly. To
avoid silent failures, `nacl.c` has been removed, and replaced with
`nacl.bindings` (with the new argument ordering). If you have code which
calls these functions (e.g. `nacl.c.crypto_box_keypair()`), you must review
the new docstrings and update your code/imports to match the new
conventions.