* raise a specific exception in the imap connector,
* Add a simple middleware to catch this exception and return a specific response that will be correctly displayed by the webmail.
see #127
* Complete folder manipulation support (add/edit/remove),
* Javascript code refactoring,
* MEDIAL_URL variable is now exposed to the javascript code.
see #55
This commit adds the following features:
* Folder creation,
* Folder modification,
* Folder removal.
There are still issues with subfolders but they should not be too complicated to fix.
I've also done some javascript refactoring.