Light version of Bitcoin.com's Bitbox library
- Taken some code analysis hint into account
- Added support for bip21 implemented by RomitRadical
- Added transaction details support
- Fixed some API issues and
- padded a private key by if it was generated shorter than 32 bytes
- added support for broadcasting more transactions
- changed resturl parameter to non-named (didn't make sense to have it named when it was the only one))
- fixed signing mechanism, so it would better handle 31-byte private key