fix #245: do not send mails to a person twice if he/she is delegate and editor.
Merge pull request #395 from karyon/fix_duplicate_mail_245

fix #245: do not send mails to a person twice if he/she is delegate and editor.
refactor the email recipient handling
fix #295: add an option to send emails to the responsible person.
Merge pull request #396 from karyon/email_to_responsible_295

add option to send emails to the responsible person, fixes #295
remove mysql from the vagrant vm
consolidate kerberos settings
use the newer, safer way to describe patterns in urls.py