Bug fixed when mailbox is saved
Mailbox.home is not mandatory for be updated in save()
Added debug toolbar

Added django-debug-toolbar as requeriments in script orchestra-admin,
so if you don't have a fresh install you will need execute:
sudo pip install django-debug-toolbar

To activate ensure in <instance>/settings.py uncomment
from orchestra.conf.devel_settings import *
Merge pull request #3 from xusy2k/master

Bug fixed when mailbox is saved