Added google map support with better user freedom on sitemap url conf…

…iguraton

Signed-off-by: Patrick Lauber <patrick.lauber@divio.ch>

cms/docs/sitemap.txt

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+Sitemap Guide
+==================
+
+Sitemap
+-------
+
+Sitemap are xml files fetched by google to help your site indexation.
+You have to tell google were the sitemap with the **Webmaster Tools**
+
+The CMSSitemap will create a sitemap with all the published pages of your cms
+
+Apps
+----
+
+Add the following to your project's ``INSTALLED_APPS`` setting::
+
+	INSTALLED_APPS = (
+		...
+		'django.contrib.sitemaps',
+		...
+	)
+
+urls.py
+-------
+
+In your main ``urls.py`` add the following import at the top of the file:
+   	from cms.sitemaps import CMSSitemap
+
+Then add the following line at the **start** of the ``urlpatterns`` definition::
+
+    	urlpatterns = (
+	url(r'^sitemap.xml$', 'django.contrib.sitemaps.views.sitemap', {'sitemaps': {'cmspages': CMSSitemap}}),),
+	...
+	)

cms/sitemaps/__init__.py

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+from cms_sitemap import *

cms/sitemaps/cms_sitemap.py

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+from django.contrib.sitemaps import Sitemap
+from cms.utils.moderator import get_page_queryset
+from cms.models import Page
+
+class CMSSitemap(Sitemap):
+    changefreq = "monthly"
+    priority = 0.5
+
+    def items(self):
+        page_queryset = get_page_queryset(None)
+        all_pages = page_queryset.published()
+        return all_pages
+
+    def lastmod(self, page):
+        return page.publication_date or page.creation_date
+