Neocore

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* `np-utils --address-to-scripthash` outputs now little-endian and big-endian scripthashes
* `np-utils --scripthash-to-address` detects input endianness and converts accordingly
* Updated dependencies

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* Added ``Size()`` method to `ECPoint` and `Fixed8` class.

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* Updated requirements: pycryptome

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* Updated dependencies, especially base58

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* Create wallets with ``np-utils --create-wallet``

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* ``BigInteger(0)`` now is ``b'\x00'`` (`PR 50 <https://github.com/CityOfZion/neo-python-core/pull/50>`_)