Add sitemaps support to stores.

app/stores/sitemap.py

@@ -0,0 +1,29 @@
+from django.contrib.sitemaps import Sitemap
+from stores.models import Store, Chain
+
+
+class StoreSitemap(Sitemap):
+    changefreq = 'weekly'
+    priority = 1
+
+    def items(self):
+        return Chain.objects.filter(active=True)
+
+    def lastmod(self, obj):
+        return obj.changed
+
+
+class ChainSitemap(Sitemap):
+    changefreq = 'weekly'
+
+    def items(self):
+        return Store.objects.filter(active=True)
+
+    def lastmod(self, obj):
+        return obj.changed
+
+
+sitemaps = {
+    'stores': StoreSitemap,
+    'chains': ChainSitemap,
+}