Added logging message to confirm when emails sent
Added logging message to confirm when emails sent

- app/mailers/user_notifier.rb - The Rails.logger will note when a
  message is sent out to a user. This will be helpful for tracking
  down any gaps between when the email is sent and when it is
  received.

Updates #740

BOWiki/BOW,EBWiki/EBWiki,BOWiki/BOW,EBWiki/EBWiki,EBWiki/EBWiki,EBWiki/EBWiki,BOWiki/BOW