addition of https://github.com/node-modules/node-biginteger
Update package.json
Update index.js

addition of https://github.com/silentmatt/javascript-biginteger
Update package.json
Update package.json
Delete BigInteger.js
Update index.js

i have added my lib to the npm finally
Merge pull request #19 from Yaffle/patch-3

addition of other libs to benchmark