Envelope verifier

signer / crypto abstractions (#39)

enveloper verifier

Upd mockstub

v1.0.4

fix delete private key from mockStub (#37)

v1.0.3: Improvement token and patch envelope (#35)

* Change settings for json serializer
* Add LockBatch and GetUTXO
* Do not check the sig for Init method
* Resolve the unclear json serialization

separate Decimal package (big.Int with scale proto)

Decimal sep pkg (#33)

token.Decimal to separate package

Balance store fixes

v1.0.1

rename token.Store interface to token.BalanceStore (#16)

Initial from https://github.com/s7techlab/cckit

added extensions:

• envelope
• token (UTXO and account balances)