Small fixes submitted by @efraimgentil. Since WildFly final is about to be released, removed note saying it was still in beta, but kept the invitation to submit bugs if readers find any.
Improvements submitted by @efraimgentil and Jesper Pedersen (RedHat). Improvements on the datasource creation and addition of command lines to configure the email session.
Improvements submitted by Scott Marlow concerning the possibility of changing the JPA implementation to EclipseLink.
Small fixes suggested by Scott Marlow.
Merge pull request #26 from htmfilho/master

Changes after feedback given by readers