Coinop

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* Minor weaks and enhancements
* Switched to pbkdf2_ctypes for performance on passphrase stretching
* Moved all the coinop modules out of the useless `bit` and `crypto` subpackages. From now on, import directly from `coinop`
* Replaced PassphraseBox's dependency on NaCl SecretBox with a (AES-CBC-256 then HMAC-SHA256)
* Removed antiquated tests and installed tox config for testing and basic PassphraseBox tests
* Python 3.3+ compatibility

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* Backporting 0.3.0 py3 support and non-nacl passphrasebox

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* network agnosticity possible -- many things don't work
* upgrade dependencies (pycoin -> 0.52, python-bitcoinlib -> 0.4.0)
* removed txt from license file -- it was bugging me
* Cleanup and increased default iterations by a factor of ten to match other coinop packages
* refactored seed/secret storage

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* Refactor seed/secret storage
* Minor bug fixes and enhancements

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* Added functionality to generate/instantiate a MultiWallet using entropic seeds instead of wallet_keys

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* Public availability