optionally do not change the initial passwords of a guest user
made date conversion Windows compatible
added init-passwords for guests and users
fixed notification bug when updating guests
added pytz to setup.py
added python-dateutil to requirements
added support for guest and groups via CLI
added __getitem__
added Mailbox service managment, password management and password check
changed order of params in login function
improved error message, implemented alternate URL
added support for extra host
added AD password reset support
fixed dependency list
added more CLI support, including setting passwords
added support for creating groups
optimized CLI for better help and lazy username/password prompt
added small CLI for group management
implemented user.delete() and get_group(gidNumber) methods
enabled working with mailinglists