Added *args, *kwargs paramters to serve/get_context/get_template

This makes it easier to pass parameters from the route method down to get_context/get_template

wagtail/wagtailcore/models.py

@@ -394,23 +394,23 @@ class Page(MP_Node, ClusterableModel, Indexed):
 
         return revision.as_page_object()
 
-    def get_context(self, request):
+    def get_context(self, request, *args, **kwargs):
         return {
             'self': self,
             'request': request,
         }
 
-    def get_template(self, request):
+    def get_template(self, request, *args, **kwargs):
         if request.is_ajax():
             return self.ajax_template or self.template
         else:
             return self.template
 
-    def serve(self, request):
+    def serve(self, request, *args, **kwargs):
         return TemplateResponse(
             request, 
-            self.get_template(request), 
-            self.get_context(request)
+            self.get_template(request, *args, **kwargs), 
+            self.get_context(request, *args, **kwargs)
         )
 
     def is_navigable(self):