Big Integer Library by Leemon

Use typescript module definition and its Documentation for reference.

This repo is thin wrapper for npm publishing. Current version is 5.5.

http://www.leemon.com/crypto/BigInt.html

All rights belongs to Baird Leemon.

Changes:
- customized bigInt2str and str2bigInt in order to accept custom base
- added umd wrapper
- code cleaned up for strict mode and some conventions