update views.py to use django shortcuts render()

was getting an error from the view.py when rendering  "unexpected keyword context_instance" - resolved it by replacing deprecated render_to_response() with render()

Author: nuljon

example/simplecms/views.py

@@ -13,6 +13,6 @@ def page_detail(request, path):
     except Page.DoesNotExist:
         raise Http404("No page found for the path '%s'" % stripped)
 
-    return render_to_response(page.template_name, {
+return render(request, page.template_name, {
         'simplecms_page': page,
-    }, context_instance=RequestContext(request))
+        })