Changes

Adds a TestingMailer to the JSF module
TestingMailer is a stub implementation of the Mailer interface intended 
to be used in the tests. This class replaces the DefaultMailer to store 
the emails sent instead of effectively sending them.
This email also adds the Email and MailBox classes to the tests module. 
This classes can be used to ease the implementation of stub Mailer. 
Actually, the JSF's TestingMailer extends the MailBox class.

Merges a temporal branch failing test.
Added a test for register user controller Created a testing mailer to
simulate send a confirmation email.