Added the option of unlimited quotas

src/pretix/base/migrations/0002_auto_20151021_1412.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='quota',
+            name='size',
+            field=models.PositiveIntegerField(help_text='Leave empty for an unlimited number of tickets.', verbose_name='Total capacity', blank=True, null=True),
+        ),
+    ]