use ecurve instead of custom ec

src/index.js

@@ -1,4 +1,3 @@
-var ec = require('./ec')
 var T = require('./transaction')
 
 module.exports = {
@@ -8,16 +7,13 @@ module.exports = {
   bufferutils: require('./bufferutils'),
   convert: require('./convert'),
   crypto: require('./crypto'),
-  ec: ec,
   ecdsa: require('./ecdsa'),
   ECKey: require('./eckey'),
-  ECPointFp: ec.ECPointFp,
   ECPubKey: require('./ecpubkey'),
   Message: require('./message'),
   opcodes: require('./opcodes'),
   HDNode: require('./hdnode'),
   Script: require('./script'),
-  sec: require('./sec'),
   Transaction: T.Transaction,
   TransactionIn: T.TransactionIn,
   TransactionOut: T.TransactionOut,