CRM-15578 - crmMailing2 - Implement "Send test" buttons
CRM-15578 - crmMailing2 - Tweak "Preview" status notification
crmMailing2 - Tweak syntax
CRM-15578 - crmMailing2 - Set default test email address to current user
CRM-15578 - Mailing.create - Fix updates to "groups" and "mailings". Add test.
CRM-15578 - crmMailing2 - Fix loading of recipient-group IDs
CRM-15578 - crmMailing2 - When ID of new mailing is established, update navbar.