Replacse JSBN with bigi

src/index.js

@@ -1,3 +1,4 @@
+var ec = require('./ec')
 var Key = require('./eckey')
 var T = require('./transaction')
 
@@ -5,17 +6,19 @@ module.exports = {
   Address: require('./address'),
   base58: require('./base58'),
   base58check: require('./base58check'),
-  BigInteger: require('./jsbn/jsbn'),
+  BigInteger: require('./bigi'),
   convert: require('./convert'),
   crypto: require('./crypto'),
+  ec: ec,
   ecdsa: require('./ecdsa'),
   ECKey: Key.ECKey,
-  ECPointFp: require('./jsbn/ec').ECPointFp,
+  ECPointFp: ec.ECPointFp,
   ECPubKey: Key.ECPubKey,
   Message: require('./message'),
   Opcode: require('./opcode'),
   HDWallet: require('./hdwallet'),
   Script: require('./script'),
+  sec: require('./sec'),
   Transaction: T.Transaction,
   TransactionIn: T.TransactionIn,
   TransactionOut: T.TransactionOut,