Simplify Django organization, add South support.

acom/main/models.py

@@ -0,0 +1,21 @@
+from django.db import models
+
+class CommonModel(models.Model):
+    ''' common model for all object types that have these standard fields '''
+
+    class Meta:
+        abstract = True
+
+    name = models.TextField()
+    description = models.TextField()
+    creation_date = models.DateField()
+    db_table = 'inventories'
+      
+class Inventory(CommonModel):
+
+    class Meta:
+        db_table = 'inventory'
+
+    id = models.AutoField(primary_key=True)
+
+