Fixed to work with latest handshake process

Added tests for BCWallet class

Added Gemfile and .gitignore

Fixed comments

Merge pull request #1 from loremipsumjp/topic

Fixed the base58_decode bug

Fixed the base58 bug

Refactored sign_transaction

Refactored send method

Refactored dispatch_message

Fixed bugs

Fixed a bug

Moved transaction accumulation to Blockchain class

Refactored send method of Network class

Made message serialization / deserialization recursive