Bitcoinlib

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* Fix pip install on some platforms

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* Add many unittests and increase coverage > 90%
* Update documentation, docstrings
* Rewrite HDWalletTransaction classes
* Improve bitcoind Service client
* Partially remove blockexplorer support and unittests
* Improve database update scripts, add version numbering

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* Improve and speed up use of ECDSA cryptography methods
* No private keys in json and dict outputs by default
* Bugfixes, PEP8 fixes and docstring updates

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* Use fastecda library instead of ecdsa
* Still support ecdsa library as fallback and for Windows
* Use RFC6979 deterministic signatures (from fastecdsa)
* Add support and Travis CI tests for Windows OS
* Add new Signature class to manage and create signatures
* Fix some private key generation issues and add extra tests

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* Add support for accounts in Segwit wallets
* Add segwit key import
* Add support for address only wallets
* Fix and update use of key paths in wallets
* Use a single method for creating wallets, mark create_multisig() as obsolete
* Return and use public keys by default
* Add dunder methods, as_dict() and as_json to main classes
* Use Address class in other classes
* Fix issues with key_depths and paths in wallets
* Update network definitions, add segwit WIFs
* Rename account_key and account_multisig_key methods to public_master()
* Performance improvements in encoding
* Many other code cleanups and bug fixes

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* Fix various issues with updating UTXO's
* Add pyscrypt support thanks to x-falcon
* Fix issues with BlockExplorer and Blockr
* Allow to sign tx with HDKey
* Allow to change wallet key names