Implement POST for receiving items

- Create new StockItem in the correct location

InvenTree/order/migrations/0011_auto_20190615_1928.py

@@ -0,0 +1,26 @@
+# Generated by Django 2.2.2 on 2019-06-15 09:28
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('order', '0010_purchaseorderlineitem_notes'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='purchaseorder',
+            name='complete_date',
+            field=models.DateField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name='purchaseorder',
+            name='received_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='+', to=settings.AUTH_USER_MODEL),
+        ),
+    ]