Update TODO.org
project.clj: Don't require lein marginalia.
Delete useless files
handler.clj: various updates

* handler.clj (set-project): New function.
(load-user): Put credentials in the session.
(uregister-form): Rename from `registration-form`.
(pregister-form): Rename from `project-form`.
(create-new-project): New private function.
(app-routes): Add route to register projects.