- Deprecate 'save' event
- Add TransactionQueue.getMinLedger(), use this as ledger_index_min
in account_tx request on reconnect
- tx.sign() no longer accepts a callback
- Add various setters and jsdoc to transaction.js
- Normalize setters, e.g. sourceTag() and destinationTag()
- Minor optimization in call to tx.hash() in TransactionManager prior
to submit; allow `serialized` argument to tx.hash() such that the
transaction is not serialized twice