Factorize members mails into a new Emails::Members module

app/mailers/emails/groups.rb

app/mailers/emails/members.rb

app/mailers/emails/projects.rb

app/mailers/notify.rb

app/models/group.rb

app/services/notification_service.rb

app/views/notify/group_access_denied_email.html.haml

app/views/notify/group_access_denied_email.text.erb

app/views/notify/group_access_requested_email.html.haml

app/views/notify/group_access_requested_email.text.erb

app/views/notify/member_access_denied_email.html.haml

app/views/notify/member_access_denied_email.text.erb

app/views/notify/member_access_granted_email.html.haml

app/views/notify/member_access_granted_email.text.erb

app/views/notify/member_access_requested_email.html.haml

app/views/notify/member_access_requested_email.text.erb

app/views/notify/member_invite_accepted_email.html.haml

app/views/notify/member_invite_accepted_email.text.erb

app/views/notify/member_invite_declined_email.html.haml

app/views/notify/member_invite_declined_email.text.erb