Changes

Add documentation and test to entities.
The documentation has been added to the "User" and "Event" entities and
the tests of those entities have been completed.

Access service for wall event
Correction of some bugs:
- supress the anotation transcient on verificationToken
- persistence.xml in jsf need the class name of the entity
- persistence.xml in rest need the class name of the entity
- *.xml update the name of the atributes to the same in
  the database and add users and events to use in the test
- UserEJB modification of the method sendConfirmationUrl
  because the other code not have a good functionality
  when the verificationToken is null
Create:
- EventEJB
- EventEJBTest
- ServiceTestSuite
Update:
- isEqualToUser ckeck the new attribute accepted
- User add new attribute and put the method getter, setter
  and registeredUser with the javaDoc of the method

 Access service for wall event
 Correction of some bugs:
 - supress the anotation transcient on verificationToken
 - persistence.xml in jsf need the class name of the entity
 - persistence.xml in rest need the class name of the entity
 - *.xml update the name of the atributes to the same in
   the database and add users and events to use in the test
 - UserEJB modification of the method sendConfirmationUrl
   because the other code not have a good functionality
   when the verificationToken is null
 Create:
 - EventEJB
 - EventEJBTest
 - ServiceTestSuite
 Update:
 - isEqualToUser ckeck the new attribute accepted
 - User add new attribute and put the method getter, setter
 and registeredUser with the javaDoc of the method
 - letta-mysql.full.sql is empty

Correction of some bugs:  - supress the anotation transcient on
verificationToken  - persistence.xml in jsf need the class name of the
entity  - persistence.xml in rest need the class name of the entity  -
*.xml update the name of the atributes to the same in    the database
and add users and events to use in the test  - UserEJB modification of
the method sendConfirmationUrl    because the other code not have a good
functionality    when the verificationToken is null
Create:
- EventEJB
- EventEJBTest
- ServiceTestSuite
- letta-mysql.inserts.sql
Update:
- isEqualToUser ckeck the new attribute accepted
- User add new attribute and put the method getter, setter
  and registeredUser with the javaDoc of the method
- Event.java is modified to put the size of attribute head to
  50 characters

task15: add test data
 -user-create-event.xml add new good events and
 bad events to prove they are not created
-User.java is modified to add public to the default
 constructor

Adds the fake smtp server and resolves minor bugs
Fake smtp server is necessary to check the sending of emails from the 
wildfly server. The script fake_smtp.sh has been added to automatice the
download and the execution of fakeSMTP-2.0 server. Besides, .jar and
.zip files used by this script have been added to .gitignore. Steps for
use this script have been added to CONTRIBUTING.md. The standalone.xml
has been modified to support the smtp connection. The pom.xml has been
modified to automatice the use of smtp server by testing servers. 
Finally, Mail ejb has been modified to reference the mail session
resource created in the standalone.xml. tsk6 completed.

Detection and correction of two errors
Rename the role Visitor to UnregisteredUser Move the method registerUser
from User to UserEJB

Adds events persistence to the EventEJB
The EventEJB class now can persist events. This commit also includes an 
important refactorization of the entity classes, that have been moved to
a new and more adequate package. In addition, the dataset classes for
user and event have been created.

Added new methods in Event.java to follow user a event, and his tests