Changes `jsbn` submodule to jeanphix/jsbn#pkcs1-oaep
Loads sha1.js
Enforces using PKCS#1-OAEP padding cipher for RSA encryption
Reverts to original jsbn as it does not accept patch
Moves pkcs#1-oaep padding outside custom jsbn module
Merge pull request #6 from Birdback/pkcs1-oaep

PKCS#1-OAEP padding