Add VAT Rates to modes, migrations and importer

RIGS/migrations/0007_vatrate.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import RIGS.models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('RIGS', '0006_auto_20141105_1553'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='VatRate',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True, serialize=False)),
+                ('start_at', models.DateTimeField()),
+                ('rate', models.DecimalField(max_digits=6, decimal_places=6)),
+                ('comment', models.CharField(max_length=255)),
+            ],
+            options={
+            },
+            bases=(models.Model, RIGS.models.RevisionMixin),
+        ),
+    ]