Check mail type for auto mail
Rebuild the sendmail form and preview of mail, posible to send email with attachment
resolve merge conflicts
some cleanup
Merge branch 'feature/VALG-86_mail_attachment' into sprint/before_eu_election_2
added detection for html header on mail
updated fields on mail node
Merge branch 'sprint/before_eu_election_2' of https://github.com/bellcom/valghalla_mail into sprint/before_eu_election_2
added batched invitations and preview to invitations
check if volunteer node is object