Fixed bug in SessionsController#destroy which caused all XHR requests, regardless of `Accept' header, to be treated as 'text/html'.

app/controllers/devise/sessions_controller.rb

@@ -27,10 +27,10 @@ class Devise::SessionsController < DeviseController
     # We actually need to hardcode this as Rails default responder doesn't
     # support returning empty response on GET request
     respond_to do |format|
-      format.any(*navigational_formats) { redirect_to redirect_path }
       format.all do
         head :no_content
       end
+      format.any(*navigational_formats) { redirect_to redirect_path }
     end
   end