added user disk quota limit

added quota warning in instance page

accounts/migrations/0006_userattributes_max_disk_size.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounts', '0005_userattributes_can_clone_instances'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='userattributes',
+            name='max_disk_size',
+            field=models.IntegerField(default=0),
+        ),
+    ]