Encode clojure.lang.BigInt correctly

Clojure BigInt encoded with appended "N" like "42N".

Transact empty Statement lists too

Allow to transact empty Statements/edn and return a valid transaction report with a txInstant timestamp.

See (Async)ConnectionTests for examples of use.

Update is published to SonaType as version 1.0.1 (see readme instructions for including the current version in your project).

Implementation complete

v1.0.0

v1.0.0 Async peer-server fixed. Implementation complete.