Remove custom hex function at networks.js

lib/networks.js

@@ -1,6 +1,8 @@
 'use strict';
 var _ = require('lodash');
 
+var BufferUtil = require('./util/buffer');
+
 /**
  * A network is merely a map containing values that correspond to version
  * numbers for each bitcoin network. Currently only supporting "livenet"
@@ -9,8 +11,6 @@ var _ = require('lodash');
  */
 function Network() {}
 
-var hex = function(hex) { return new Buffer(hex, 'hex'); };
-
 /**
  * @instance
  * @member Network#livenet
@@ -24,7 +24,7 @@ _.extend(livenet, {
   scripthash: 0x05,
   xpubkey:  0x0488b21e,
   xprivkey: 0x0488ade4,
-  networkMagic: hex('f9beb4d9'),
+  networkMagic: BufferUtil.integerAsBuffer(0xf9beb4d9),
   port: 8333,
   dnsSeeds: [
     'seed.bitcoin.sipa.be',
@@ -49,7 +49,7 @@ _.extend(testnet, {
   scripthash: 0xc4,
   xpubkey: 0x043587cf,
   xprivkey: 0x04358394,
-  networkMagic: hex('0b110907'),
+  networkMagic: BufferUtil.integerAsBuffer(0x0b110907),
   port: 18333,
   dnsSeeds: [
     'testnet-seed.bitcoin.petertodd.org',