Changes

Adds the EJBs for the User registration.
The EJBs for the User registration has been added (included the email
service). The cleanup.sql script has been updated including the User and
Registration tables. The beans.xml has been updated including the
TestingMailerEJB. The standalone.xml (additional-material/wildfly) has
been updated including the configuration to send emails (the destination
host is localhost and the destination port is 25).