增加测试用例版本号，用于judger重新编译spj程序

contest/migrations/0016_contestproblem_spj_version.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.1 on 2016-04-06 04:20
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contest', '0015_auto_20160404_1641'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='contestproblem',
+            name='spj_version',
+            field=models.CharField(blank=True, max_length=32, null=True),
+        ),
+    ]