Fix the classmethod and the name error.
Add get_article method to Article.
Add Article Handler.
Add ArticleSubmit handler.
Add have_article method to Article class.
Add CommentSubmitHandler.
Add LogoutHandler.
Add comment to CommentSubmitHandler.
Add reverse_url support.
Use exists() to check an instance exist or not.
Add count and part method.
ArticleListHandler added.
Add HomeHandler.