fix Buffer.concat use

Block.js

@@ -182,7 +182,7 @@ function spec(b) {
         var i2 = Math.min(i + 1, size - 1);
         var a = tree[j + i];
         var b = tree[j + i2];
-        tree.push(util.twoSha256(buffertools.concat(a,b)));
+        tree.push(util.twoSha256(Buffer.concat([a,b])));
       }
       j += size;
     }

Script.js

@@ -382,7 +382,7 @@ function spec(b) {
   Script.prototype.writeBytes = function (data)
   {
     var newSize = this.buffer.length + prefixSize(data.length) + data.length;
-    this.buffer = buffertools.concat(this.buffer, encodeLen(data.length), data);
+    this.buffer = Buffer.concat([this.buffer, encodeLen(data.length), data]);
     this.chunks.push(data);
   };
 

ScriptInterpreter.js

@@ -303,7 +303,7 @@ function spec(b) {
           v2 = this.stackTop(1);
           this.stackPop();
           this.stackPop();
-          this.stack.push(buffertools.concat(v1, v2));
+          this.stack.push(Buffer.concat([v1, v2]));
           break;
 
         case OP_SUBSTR:

Transaction.js

@@ -17,7 +17,7 @@ function spec(b) {
   var VerificationError = error.VerificationError;
   var MissingSourceError = error.MissingSourceError;
 
-  var COINBASE_OP = buffertools.concat(util.NULL_HASH, new Buffer('FFFFFFFF', 'hex'));
+  var COINBASE_OP = Buffer.concat([util.NULL_HASH, new Buffer('FFFFFFFF', 'hex')]);
 
   function TransactionIn(data) {
     if ("object" !== typeof data) {
@@ -44,7 +44,7 @@ function spec(b) {
     var qbuf = new Buffer(4);
     qbuf.writeUInt32LE(this.q, 0);
 
-    return buffertools.concat(this.o, slen, this.s, qbuf);
+    return Buffer.concat([this.o, slen, this.s, qbuf]);
   };
 
   TransactionIn.prototype.getOutpointHash = function getOutpointHash() {
@@ -88,7 +88,7 @@ function spec(b) {
 
   TransactionOut.prototype.serialize = function serialize() {
     var slen = util.varIntBuf(this.s.length);
-    return buffertools.concat(his.v, slen, this.s);
+    return Buffer.concat([his.v, slen, this.s]);
   };
 
   function Transaction(data) {
@@ -537,7 +537,7 @@ function spec(b) {
     var buffer = bytes.buffer();
 
     // Append hashType
-    buffer = buffertools.concat(buffer, new Buffer([parseInt(hashType), 0, 0, 0]));
+    buffer = Buffer.concat([buffer, new Buffer([parseInt(hashType), 0, 0, 0])]);
 
     return util.twoSha256(buffer);
   };
@@ -612,7 +612,7 @@ function spec(b) {
       var voutBuf = new Buffer(4);
       voutBuf.writeUInt32LE(vout, 0);
   
-      txin.o = buffertools.concat(hash, voutBuf);
+      txin.o = Buffer.concat([hash, voutBuf]);
   
       txobj.ins.push(txin);
     });

util/util.js

@@ -320,7 +320,7 @@ var varIntBuf = exports.varIntBuf = function varIntBuf(n) {
 };
 
 var varStrBuf = exports.varStrBuf = function varStrBuf(s) {
-  return buffertools.concat(varIntBuf(s.length), s);
+  return Buffer.concat([varIntBuf(s.length), s]);
 };
 
 // Initializations