* Fix eth_keys to follow nimble rules.
Fix eth_keys to follow NEP-1 rules.
Fix eth_keys to work properly with libsecp256k1 (do not raise uncatchable exceptions).
Added more tests from py_evm, go-ethereum, cpp-ethereum.
Added address utility functions.
Changed public api, to be compatible with more modules.
* Fix newline.
* Added proper appveyor.yml.
* Fix appveyor.yml.
* Removed safeXXX functions.
* Removed Nonce object declaration.
Removed EthKeysContext possibility of inheritation.
Added shutdownLibsecp256k1() and shutdown() procedures.
Some documentation comments got modified.
* Removed RawPublicKey and RawSignature bytes.
getRaw(PublicKey) and getRaw(Signature) are now returning arrays.
Added toRaw(PublicKey, data) and toRaw(Signature, data).
* Added `$` hexadecimal string representation functions.
Added initSignature functions.
Added some previous tests.
* Removed 0x prefixes from `$` functions.
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