Merge branch '399-contact-list-unread-messages' into 'master'

Contact List Unread Messages

Adds unread count as bubble to avatar image in contact list.

Please note that this is based on !190.

![device-2016-05-18-124534](/uploads/647dbdcff73a69eb6cf1814f85cbffe6/device-2016-05-18-124534.png)![device-2016-05-18-124339](/uploads/fa56a44f229234bb86fdebf8f9060927/device-2016-05-18-124339.png)

Closes #399

See merge request !192