[feature request] maildir support

[pank]

Thanks for providing this extension.

Would it be possible to support maildir?

Use case: I download my emails via Offlineimap and read them via Emacs Gnus.

Potentially implementation thoughs:
Basically, all that is needed is a inotify watching changes in the cur directory in the maildir folder. The feature is also available in Conky, and I also have a python inotify script that watch a maildir. Neither integrate with the Gnome Shell, however.

Edit: Thanks for reading this!