Added second keypair for encryption of domain names.

Changed keys file format to include second pair of keys, it will be in TOML now.
Made many adjustments to block and transaction structures.
Changed block serialization to binary format for hashing/mining.
Removed old build dependencies.

src/lib.rs

@@ -7,14 +7,14 @@ pub use crate::miner::Miner;
 pub use crate::p2p::Network;
 pub use crate::settings::Settings;
 pub use crate::bytes::Bytes;
-pub use crate::keys::Keystore;
+pub use crate::keystore::Keystore;
 pub use crate::simplebus::*;
 pub use crate::commons::*;
 
 pub mod blockchain;
 pub mod commons;
 pub mod simplebus;
-pub mod keys;
+pub mod keystore;
 pub mod miner;
 pub mod context;
 pub mod event;