Support for saving files about ethsign HOT 5 CLOSED

@tworec Great stuff, thanks a lot. I'd welcome a PR to update the readme and cross-reference ethkey as higher-level library to manage KeyFiles.

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I was wondering if it will not be too intrusive. I'll make an PR in some spare time ;)

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See #11 it will be possible to do:

let secret: SecretKey = ...;
let crypto = secret.to_crypto(password, iterations).unwrap();
let keyfile = keyfile::KeyFile {
 id: "Whataver",
 version: 3,
 crypto,
 address: Some(secret.public().address()),
};

// then since `KeyFile` is Serializable you can do:
let mut file = std::fs::File::create("keyfile.json").unwrap();
serde_json::to_writer_pretty(&mut file, keyfile);

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didn't see this ;) and #11 when implementing #12

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Above code sample is not valid. Address should be

address: Some(Bytes(secret.public().address().to_vec())),

I've created crate ethkey which simplifies keystore creation

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