fix computation of fee without change output

lib/transaction/transaction.js

@@ -205,7 +205,7 @@ Transaction.prototype.getSerializationError = function(opts) {
     unspentError = this._hasFeeError(opts, unspent);
   }
 
-  return  unspentError ||
+  return unspentError ||
     this._hasDustOutputs(opts) ||
     this._isMissingSignatures(opts);
 };
@@ -394,7 +394,7 @@ Transaction.prototype._checkConsistency = function() {
     $.checkState(this._changeScript);
     $.checkState(this.outputs[this._changeIndex]);
     $.checkState(this.outputs[this._changeIndex].script.toString() ===
-                 this._changeScript.toString());
+      this._changeScript.toString());
   }
   // TODO: add other checks
 };
@@ -845,7 +845,7 @@ Transaction.prototype._clearSignatures = function() {
 };
 
 Transaction._estimateFee = function(size, amountAvailable) {
-  var fee = Math.ceil(size / Transaction.FEE_PER_KB);
+  var fee = Math.ceil(size / 1000) * Transaction.FEE_PER_KB;
   if (amountAvailable > fee) {
     size += Transaction.CHANGE_OUTPUT_MAX_SIZE;
   }