Fix #202 -- Allow the manual ordering of questions

* Allow the manual ordering of questions
Update Unit Tests
Fix some typos

* Add migrations

* Minor notation change

src/pretix/base/migrations/0032_question_position.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.9 on 2016-08-21 19:27
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0031_auto_20160816_0648'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='question',
+            name='position',
+            field=models.IntegerField(default=0),
+        ),
+    ]