Refactor DateTimeUtils to BwplDateTime class for dealing with BWPL date and time functions so as to make it more testable.
Delete RegistrationDataUtils as it is no longer used.
Added BwplProperties class as quick and dirty way to configure properties, in particular email lists. Added new RegistrationsExportJob to email exported registrations list every Saturday at 2am.
Added weekly validation summary email. Also improved email functions to make them more robust and check for empty email body strings which can cause the mail plugin to throw an exception.
Bump version to 1.15