Event should have a flag to prevent welcome e-mail if desired
Decision on sending e-mail
Participant should ask for referer code if needed
Build forcing
Otro build
Merge pull request #14 from kleer-la/mailing-options-and-registration-referer

Mailing options and registration referer
Merge pull request #15 from kleer-la/develop

Mailing options and registration referer
Merge branch 'plantilla-email', remote-tracking branch 'origin' into plantilla-email