Kazecore

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* Added ``Fixed8.ToJsonString()`` (`PR 33 <https://github.com/KAZEBLOCKCHAIN/kaze-python-core/pull/33>`_)

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* Added UInt ``To0xString`` method

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* Documentation update
* Moved the ``cryptography`` dependency to ``requirements_dev.txt``

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* Added ``kaze.Cryptography`` and ``KeyPair``
* Changed signature of ``kazecore.Cryptography.Crypto.Sign()`` to remove unused ``public_key`` argument
* Removed redundant ``kazecore.Cryptography.Helper.hash_to_wallet_address()`` function, use ``kazecore.Cryptography.Helper.scripthash_to_address()`` instead.
* Removed unused ``kazecore.Cryptography.Helper`` functions: ``random_string``, ``bytes_to_hex_string``, ``bin_sha256``, ``sha256``, ``random_key``.

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* Bugfix for deploying from Travis to PyPI/kazecore

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* Bugfix for BinaryWriter (`PR 13 <https://github.com/KAZEBLOCKCHAIN/kaze-python-core/pull/13>`_)