fix mssql query generator for transactions

lib/dialects/mssql/query-generator.js

@@ -530,15 +530,15 @@ var QueryGenerator = {
   },
 
   startTransactionQuery: function(transaction, options) {
-    if (options.parent) {
+    if (transaction.parent) {
       return 'SAVE TRANSACTION ' + this.quoteIdentifier(transaction.name) + ';';
     }
 
     return 'BEGIN TRANSACTION;';
   },
 
-  commitTransactionQuery: function(options) {
-    if (options.parent) {
+  commitTransactionQuery: function(transaction) {
+    if (transaction.parent) {
       return;
     }
 
@@ -546,7 +546,7 @@ var QueryGenerator = {
   },
 
   rollbackTransactionQuery: function(transaction, options) {
-    if (options.parent) {
+    if (transaction.parent) {
       return 'ROLLBACK TRANSACTION ' + this.quoteIdentifier(transaction.name) + ';';
     }