Send mail to all meeting participants
Spec tests for MeetingMailer
Extract all meeting participants and send email using a loop to avoid specify BCC option
Spec test to check number of delivered emails
Switch handling logic of no_self_notified setting
Merge pull request #52 from slawa85/feature/14521-mail-sent-to-author-of-meeting
Adapt version to corresponding OpenProject core version
Update stable to v3.0.11