Various updates.
Add segregated witness and regtest, fixes.
Update for check-sequence-verify.
Fix tx-decode by eliminating payment address version.
Fix subscriptions, add watch-stealth and new languages.
Major new features and improved quality.
Fix tx-encode and certificate handling.
Update for p2p networking in libbitcoin.
Upgrade for libbitcon server and bip39.
Initial release of bx, successor to sx.