Message deletion in IMAP is a two step process: first delete, then expunge.
Deleting a message just sets a flag that usually makes the mail client hide
the message. It is the expunge that actually removes the message.
Thus, exclude the deleted messages so that the unread count matches up with
that of most mail clients.
* Clean-up, ordering, constants, and extend of schema
* Put REQUIREMENTS back and re-add line breaks
* Clean-up, ordering, constants, and extend of schema
* Extend platform
* Imap unread email sensor
Checks the inbox of a imap account for unread emails. Tested against
gmail.
Example config:
```
sensor:
- platform: imap
name: gmail test
user: USER
password: PASSWORD
server: imap.gmail.com
port: 993
```
* added to .coveragerc
* Code cleanup and typo fix.
* Added port range validation
* Fix lint errors
Fabian Affolter
Anders Melchiorsen
Pascal Vizeli
Dan