O365

Features:
- Account: added public client auth flow
- Directory: added query params to retrieve users
- Calendar: now adapted to teams online meetings
- Contact: added personal notes

Features:
- Bug fixing release

Features:
- NEW: MS Teams available
- Drive: new method "get_drive" in DriveItems

Features:
- Connection: now allows to pass a custom Json Encoder ("json_encoder" param).
- Added WorkBookApplication on excel.py that can run manual calculations on workbooks.

Features:
- NEW: Outlook Categories. Modified Message, Event and Contact to accept Category instances
- TokenBackends: Implementation of 'should_refresh_token' for environments where multiple account instances are racing against each other to refresh the token. The BaseTokenBackend 'get_token' is now a default and it's not intended to be subclassed. Instead a new 'load_token' is defined to be subclassed.
- User: Profile photo implemented
- Contact: Profile photo implemented
- Drive: can set a custom name when using 'upload_file'
- Utils: updated timezones

Features:
- NEW: Directory and User objects
- Removed the GAL from address_book.py. Now the users are queried from the Directory object
- Account: Added 'directory' and 'get_current_user' methods
- Message: Constructor now loads present attachments