0.3.4

- [X] PR fix typo in readme - https://github.com/ardumont/org-trello/pull/120
- [X] Fix webadmin button to delete running action
- [X] Add version emacs 24.3.50 in documentation
- [X] Improve computation level for checkbox (checklist/items) - https://github.com/ardumont/org-trello/issues/121#issuecomment-37559929
- [X] Improve documentation
- [X] Upgrade version
- [X] Release notes